_C_LABEL() and _ASM_LABEL() are no longer useful in the "everything
is ELF" world. Eliminate use of them in amd64, arm64, armv7, i386,
macppc, mips64, and sparc64 code.

ok deraadt@ jca@ krw@

Address the clang 13 "changed binding to STB_WEAK" warning on arm (32bit):
* add _?ENTRY_NB to arm/asm.h
* make sure ld.so's arm asm bits see the same includes as libc
* switch libc's arm bits to

Address the clang 13 "changed binding to STB_WEAK" warning on arm (32bit):
* add _?ENTRY_NB to arm/asm.h
* make sure ld.so's arm asm bits see the same includes as libc
* switch libc's arm bits to the generic DEFS.h
* switch arm ASM bits from ENTRY to ENTRY_NB as necessary

ok kettenis@ miod@

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Make brk() and sbrk() weak again as intended.

Apparently spotted by mortimer@ while working on clang 13 and amd64.
No actual change on sparc64 as this architecture still uses ld.bfd.
ok kettenis@

Avoid .align 0. Clang's integrated assembler actually honors this directive
and the resulting byte-alignment triggers unaligned access.

ok patrick@, deraadt@

Use internal names for __errno, _memcpy, memset, and {,_}{set,long}jmp
Eliminate pointless use of PIC_SYM()
Split out DEFS.h from SYS.h like some other archs

ok kettenis@ deraadt@

Consistently reference '_end' instead of 'end' in the brk/sbrk implementation

ok deraadt@

Adds hidden _libc_FOO aliases for the system call stubs.
Stop generating _brk and _sbrk symbols: they've already been hidden.
Set the ELF symbol size on the syscall stubs.
Give the __{min,cur}brk sym

Adds hidden _libc_FOO aliases for the system call stubs.
Stop generating _brk and _sbrk symbols: they've already been hidden.
Set the ELF symbol size on the syscall stubs.
Give the __{min,cur}brk symbols a size and type, and hide more jump labels.

alpha, arm, m88k, sh, sparc, and vax assistance miod@
hppa assistance kettenis@
ok deraadt@ miod@

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Hide many (194!) symbols that nothing should be using.
Delete exect(2); it wasn't portable across archs and nothing used it.

ports test build by naddy@
ok deraadt@ kettenis@

Convert cpp | as rules in bsd.lib.mk and lib/libc/sys/Makefile.inc to pure cc
invocations. This allows us to use the compiler builtin define __PIC__ to check
for PIC/PIEness rather than passing -DPI

Convert cpp | as rules in bsd.lib.mk and lib/libc/sys/Makefile.inc to pure cc
invocations. This allows us to use the compiler builtin define __PIC__ to check
for PIC/PIEness rather than passing -DPIC. Simplifies PIE work a lot.

ok matthew@, conceptually ok kurt@

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add some missing $, ok djm@ 'That looks fine to me' millert@

Update from netbsd, prodded by miod@

Do not generate text relocations in PIC code.

arm libc support. From NetBSD. currently supports softfloat.