Build with -std=gnu89 to fix the build with clang-16

This is ancient GNU software that tends to break whenever clang adds
more warnings about deprecated features in new languages versions or
turns t

Build with -std=gnu89 to fix the build with clang-16

This is ancient GNU software that tends to break whenever clang adds
more warnings about deprecated features in new languages versions or
turns them into errors. Using -std=gnu89 (the defaults for base-gcc)
for those packages means we'll probably avoid most new warnings, errors,
and possible miscompilations when updating clang.

This fixes the build of libiberty and texinfo with clang-16.

ok robert@

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Pass CC/CFLAGS/LDFLAGS to the configure script. ok millert@

remove misc. depend and yacc nits that no longer matter.
okay millert@

mark files as BUILDFIRST, or write explicit dependencies, so that most
programs will build even without a make depend first.
okay tb@ millert@

quote ${CC} expansion, from andreas.kahari at icm uu se, ok mpi@

Now that gcc 2.95 is out of the tree, get rid of the old hash table interface
it was the only user of. Bump major.

remove leftover NOLINT, WANTLINT, LINTFLAGS, LOBJ vars and lint targets.

ok guenther@

Compile the v3 demangler support code in libiberty, bump minor. Will be used
in a not-so-distant future.
ok kettenis@ (some time ago)

Add fopen_unlocked.c pex-unix.c pex-common.c unlink-if-ordinary.c to
the list of built files and switch the md5.h header to the libiberty
one. This change is needed by gcc4 and it is a major library

Add fopen_unlocked.c pex-unix.c pex-common.c unlink-if-ordinary.c to
the list of built files and switch the md5.h header to the libiberty
one. This change is needed by gcc4 and it is a major library crank for
libiberty.
tested by many people on many architectures and finally ok'd by deraadt@

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Merge OpenBSD specific changes:
- pexecute implementation replaced with the older gcc 2.95 implementation,
as gcc 2.95's collect2 relies upon an implementation behaviour which has
been lost in fu

Merge OpenBSD specific changes:
- pexecute implementation replaced with the older gcc 2.95 implementation,
as gcc 2.95's collect2 relies upon an implementation behaviour which has
been lost in further libiberty updates.
- keep the old hash table interfaces, which are used by gcc 2.95.
- keep the OpenBSD replacement for the md5 interface.
- keep the OpenBSD strl{cat,cpy} and snprinft usage.

Bump libiberty minor version due to the addition of a few new symbols.

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makeinfo --no-split, simplifies sets immensely.
Approved deraadt@, kettenis@

gnu code will never, ever, EVER, get close to passing lint

cute side-effect of bsd.lib.mk, some typos only show up with make tags.
noticed by marco@

okay millert@

Update floatformat.[ch] to gdb-6.1 version. Include regex.c in library.
ok otto@, pval@

resurrect pexecute.c for now, since vax and m68k barf on pex-unix.c

add libiberty.info to CLEANFILES

ok espie@

Compile the right files, bump minor number.

Build the new pieces of libiberty that gcc3 will want.
Bump major because of changes in c++ demangler.

Fix build for new location

Add build pieces