t_posix_memalign: Simplify.

No functional change intended.

t_posix_memalign: Fix this to reflect restriction lifted in C17.

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

Don't require size to be a multiple of alignment. This is no longer a
requirement as of C18.

branches: 1.4.14; 1.4.16;
Fix code style errors pointed out by christos during the review of the
aligned_alloc test that also applies to the posix_memalign test.
Fix code style errors that I forgot to fix in the aligned_alloc test.

Add the C11 function aligned_alloc to libc.

Rename some test case names. No functional change.

Convert a few more tests from regress to atf

Don't require size to be a multiple of alignment. This is no longer a
requirement as of C18.

branches: 1.4.14;
Fix code style errors pointed out by christos during the review of the
aligned_alloc test that also applies to the posix_memalign test.
Fix code style errors that I forgot to fix in the aligned_alloc test.

Add the C11 function aligned_alloc to libc.

Rename some test case names. No functional change.

Convert a few more tests from regress to atf

Fix code style errors pointed out by christos during the review of the
aligned_alloc test that also applies to the posix_memalign test.
Fix code style errors that I forgot to fix in the aligned_alloc test.

Add the C11 function aligned_alloc to libc.

Rename some test case names. No functional change.

Convert a few more tests from regress to atf