t_posix_memalign: Expand test cases and properties.

- Test cartesian product of a sampling of sizes and a sampling of
alignments.

- Verify all the edge cases I could find in posix_memalign and

t_posix_memalign: Expand test cases and properties.

- Test cartesian product of a sampling of sizes and a sampling of
alignments.

- Verify all the edge cases I could find in posix_memalign and
aligned_alloc, including failure modes.

- Test an unreasonably large (but aligned) allocation size.

- Use ATF_CHECK_* instead of ATF_REQUIRE_* so all failures will be
reported, not just the first one.

- While here, build with -fno-builtin-aligned_alloc and with
-fno-builtin-posix_memalign to make sure the compiler doesn't try
any shenanigans.

XXX pullup-10

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Add basic checks for a64l(3), l64a(3), and l64a_r(3).

After a comedy of errors, move t_mbtowc to its final resting place.

Use -Wl,--no-fatal-warnings for the mktemp(3) test.

Start moving the remaining tests from src/regress to src/tests.

Move the test for mktemp(3) to the right place.

Add __TEST_FENV

Sync list of fenv enabled architectures again (PR 48633), this time for mips
addition.

While PR 48633 is not properly fixed, keep the additional lists of
fenv-enabled architectures in sync.

- new test for strtoi
- namespace protection for strto{i,u}
- separate manpages for strto{i,u} from the ones for strto{u,}l
From: Kamil Rytarowski

Move the list of <fenv.h> supporting architectures to the makefile and
sync it with other copies.

Try fixing t_strtod to not depend on -ffloat-store by adding the
necessary volatiles.

Few fundamental consistency checks for the abs(3) family.

Few naive consistency checks for the atoi(3) family.

Add a small test that checks that random(3) does not always return zero when
the RNG is initialized with zero. Prompoted by the recent nasty bug in the
OpenBSD libc.

Restrict -ffloat-store to t_strtod.c.

See that system(3) works.

Fix wrong linker flag that has always been lurking here.

Split out the -lpthread tests to a separate file.

XXX: The only thing gained from this is seeing whether -lpthread breaks
the getenv(3) family. Yet, a strict hypothesis about this would require

Split out the -lpthread tests to a separate file.

XXX: The only thing gained from this is seeing whether -lpthread breaks
the getenv(3) family. Yet, a strict hypothesis about this would require
that the two test files are identical, which they are not.

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Merge 't_environment' and 't_environment_pth'.

Add some tests for strtol(3).

Add -ffloat-store add test lib/45020 also with __isnanl().

Few basic tests for exit(3).

Try to maintain the structure of libc and move 't_strtox' to 't_strtod'.

Add simple test cases for ttyname(3), strtod(3), and getgrent(3).