Check struct stat.st_blocks with AC_CHECK_MEMBERS

[petk]

The AC_STRUCT_ST_BLOCKS expects fileblocks object to be compiled using AC_LIBOBJ in case stat.st_blocks is missing on some system. This can be simplified with the usual AC_CHECK_MEMBERS since PHP is using the stat.st_blocks (and stat.st_blksize) conditionally.

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

[petk]

Hm, I guess, PHP needs more adjustments then if these are missing...

php-src/ext/phar/stream.c: In function ‘phar_dostat’:
php-src/ext/phar/stream.c:535:17: error: ‘zend_stat_t’ {aka ‘struct stat’} has no member named ‘st_blksize’; did you mean ‘st_size’?
  535 |         ssb->sb.st_blksize = -1;
      |                 ^~~~~~~~~~
      |                 st_size
php-src/ext/phar/stream.c:536:16: error: ‘zend_stat_t’ {aka ‘struct stat’} has no member named ‘st_blocks’
  536 |         ssb->sb.st_blocks = -1;
      |                ^
make: *** [Makefile:1592: ext/phar/stream.lo] Error 1
make: *** Waiting for unfinished jobs....
php-src/ext/phar/func_interceptors.c: In function ‘phar_file_stat’:
php-src/ext/phar/func_interceptors.c:642:28: error: ‘zend_stat_t’ {aka ‘struct stat’} has no member named ‘st_blksize’; did you mean ‘st_size’?
  642 |                         sb.st_blksize = -1;
      |                            ^~~~~~~~~~
      |                            st_size
php-src/ext/phar/func_interceptors.c:643:27: error: ‘zend_stat_t’ {aka ‘struct stat’} has no member named ‘st_blocks’
  643 |                         sb.st_blocks = -1;
      |                           ^
make: *** [Makefile:1595: ext/phar/func_interceptors.lo] Error 1

[petk]

Patch updated a bit further and branch rebased. It seems that there was a plan here to implement the missing st_blksize and st_blocks stat members on Windows at some point also. I'll wait with this PR a bit further as isn't critical. It only makes it a bit clearer how the usage should be done at this point. Also those above errors are not relevant in PHP as these two members are used conditionally in the code.