(FCT): Use size_t, not unsigned int, for sizes.
(EXT): Use ptrdiff_t, not int, for a variable that has to
store a size-related quantity but might go negative.
ptrdiff_t is good enough here, since in practice the value
can't exceed SIZE_MAX/2.
with like-named macro in fnmatch.c.
(EXT): Use an internal constant instead.
Merge fnmatch patches from glibc.
(FCT): Cast to int32_t and UCHAR when appropriate.
Adjust to renaming of collseq_table_lookup to __collseq_table_lookup.
