libc/glob: Fix a -Wstrict-prototypes warning by bringing back an old fix.

It went like this:

* In 2005, joerg fixed this warning in DragonFly (2a6aec8dab58c89961).

* In 2013, this fix was overwrit

libc/glob: Fix a -Wstrict-prototypes warning by bringing back an old fix.

It went like this:

* In 2005, joerg fixed this warning in DragonFly (2a6aec8dab58c89961).

* In 2013, this fix was overwritten without looking with the then still
broken version from FreeBSD (0d5acd7467c4e95f79).

* In 2015, joerg submitted the fix to FreeBSD and it was committed as
r288098.

This commit applies back FreeBSD's r288098 to our tree. :)

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libc: Add prototypes for various functions we use in __weak_reference().

libc/stdlib: Fix two -Wunused-parameter warnings.

libc/dmalloc: Adjust for aligned_alloc() changes.

Follow up for d3a54aee8be483132cb76ecb195180d8c3cf9ed4.

libc/dmalloc: Fix unused warning for non INVARIANTS.

libc/stdlib: Refactor aligned_alloc().

* Lift the restriction from posix_memalign() that alignment should be
more or equal to sizeof(void *).
* Make aligned_alloc() a weak symbol.
* Adjust

libc/stdlib: Refactor aligned_alloc().

* Lift the restriction from posix_memalign() that alignment should be
more or equal to sizeof(void *).
* Make aligned_alloc() a weak symbol.
* Adjust the manpage.

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libc/stdlib: Add __cxa_thread_atexit_impl() hook.

The __cxa_thread_atexit_impl() helper is needed for mainly c++ runtime
libraries to support destructors for thread local storage using LIFO.
The _th

libc/stdlib: Add __cxa_thread_atexit_impl() hook.

The __cxa_thread_atexit_impl() helper is needed for mainly c++ runtime
libraries to support destructors for thread local storage using LIFO.
The _thread_finalize() is implemented based on OpenBSD variant with few
exceptions: less restrictive destructors calling scheme and c++ runtime
preserves implementation details how it orders (or even uses) this libc
addition. Based on other BSDs and libsdc++/libc++ code this is least
intrusive method to have pthread_exit() hooks in libc runtime. By the
looks, in base system nothing was using libstdc++ internal version.

While there, enable __cxa_thread_atexit_impl() usage in gcc80 libstdc++.

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libc/stdlib: Avoid calling destructors in a wrong order.

There is a possibility that dso handle in __cxa_finalize() might be owned
by another dso. On exit(3) calling these destructors is pointless.

libc: Fix some -Wunused-parameter warnings.

libc/libpthread: Add guard to fix redundant __isthreaded declarations.

libc/stdio: Remove two redundant prototypes.

libc/net: Remove some unneeded externs.

Prototypes are in netdb_private.h.

I had forgotten this in a1ff66cb7764cf805b759f2c7bfc51a8a11cf1aa.

Fixes some -Wredundant-decls warnings.

libc/db: Add an include guard.

joerg had added one back in 2005 in 871020e7804af32d9a544b48cd250fa4
but it was overwritten 8 years later in another sync with FreeBSD in
abd448c3b2d3508465e48d9cfdb16

libc/db: Add an include guard.

joerg had added one back in 2005 in 871020e7804af32d9a544b48cd250fa4
but it was overwritten 8 years later in another sync with FreeBSD in
abd448c3b2d3508465e48d9cfdb163ef88fc242e.

This fixes a number of -Wredundant-decls which we'll hopefully enable
by default in the future.

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str{,case}cmp.3: Remove further bcmp(3) references.

memcmp.3: Remove bcmp(3) reference.

libc: Merge bcmp.3 and memcmp.3.

This follows the merge in the code in 83d15e579c5b3b6ab775b345f1d68069.

kernel - make bcmp linux-compatible, add memcmp
world - make bcmp linux-compatible

* Make bcmp and memcmp the same. Our bcmp() was returning
0 or 1 (not subtracting the last byte), which is comp

kernel - make bcmp linux-compatible, add memcmp
world - make bcmp linux-compatible

* Make bcmp and memcmp the same. Our bcmp() was returning
0 or 1 (not subtracting the last byte), which is compatible
with the manual page but it isn't what linux does.

* It also looks like memcmp is sometimes turned into bcmp by
the compiler (?), at least when compiling the kernel, so
we don't want to break that either.

* Add memcmp to the kernel build, synchronize both memcmp and bcmp
from libc.

* This makes our bcmp compatible with linux.

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wait.2: Fix excessive .Dv usage. Use proper markup.

libc - Update manual page for wait.2

* Update the manual page for wait.2, properly describing the
si_code and si_status fields of the siginfo_t structure to
match recent fixes.

Fix some self references in our manual pages.

Use .Fn for function names in some manual pages.

Fix some section name typos in various manual pages.

While here, fix some other minor issues like starting new sentences
on new lines etc.

Adjust various things for the recent brk(2) removal.

libc: Remove old MLINKS for fpclassify.3.

I forgot to remove them in b6b35a1b4c682b25f983fc039f153dcd04094189.

Reported-by: zrj

libc/sysvipc: Remove duplicate include.