The `<assert.h>` header file is part of the standard C89 headers [1] and
on older systems there needed to be also a manual check if header is
present.
Since PHP requires at least C89 manual check and the `HAVE_ASSERT_H`
symbol defined by Autoconf in configure.ac can be both removed [2].
This patch also removes unused <assert.h> includes where c files don't
use the `assert()` macro.
Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4
Test case: strnatcmp_ex(L"333", 3, L"333 ", 4, true)
The reason this bug didn't come up earlier is probably because most input strings are null-terminated.
Till now the actualy length diff between the strings was under
circumstances returned. Whereby for a compare function only return
values of (1, 0, -1) make sense. Thus the old behavior isn't
present anymore, natcmp_ex now behaves as a standard compare function.
@ <mbp@humbug.org.au>. (Andrei)
Martin Pool updated the natural comparison/sort algorithm so that fractions
compare more "naturally", e.g. 1.002 < 1.1.
@- Added natural comparison/sorting routines strnatcmp(), strnatcasecmp(),
@ natsort(), and natcasesort(). These are useful for comparing and sorting
@ strings that contain numbers. Based on the code from Martin Pool
@ <mbp@humbug.org.au>. See http://www.linuxcare.com.au/projects/natsort/
@ for more info on natural sorting. (Andrei)
