The AC_STRUCT_ST_BLOCKS expects fileblocks object to be compiled with
AC_LIBOBJ if stat.st_blocks is missing on the system. This can be
simplified with the usual AC_CHECK_MEMBERS since PHP is using the
stat.st_blocks (and stat.st_blksize) conditionally.
These members are mostly present on all POSIX-based systems except on
Windows these days.
This also removes the obsolete HAVE_ST_BLOCKS symbol:
https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/types.m4?h=v2.72#n1055
Additionally, the st_blksize and st_blocks members are checked
conditionally with HAVE_ preprocessor macros. Instead of filtering
Windows specifically here, the preprocessor macros
HAVE_STRUCT_STAT_ST_BLKSIZE and HAVE_STRUCT_STAT_ST_BLOCKS can be used.
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