Snippets for fontconfig 2.18.2 from Fedora x86_64

Sourced from https://kojipkgs.fedoraproject.org/packages/fontconfig/2.18.2/3.fc45/data/logs/x86_64/build.log.

../fc-cat/fc-cat.c:259:16: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable=]
  259 |     int        ret = 0;
      |                ^~~

../test/test-bz106632.c:189:11: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  189 |     (void)system (cmd);
      |           ^~~~~~~~~~~~

../test/test-bz106632.c:216:11: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  216 |     (void)system (cmd);
      |           ^~~~~~~~~~~~

../test/test-bz106632.c:258:11: warning: ignoring return value of ‘system’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  258 |     (void)system (cmd);
      |           ^~~~~~~~~~~~

../src/fcint.h:172:47: warning: pointer ‘leaves_109’ may be used after ‘realloc’ [-Wuse-after-free]
  172 | #define FcOffsetToPtr(b, o, t)         ((t *)((uintptr_t)(b) + (ptrdiff_t)(o)))
      |                                               ^~~~~~~~~~~~~~

../src/fcint.h:172:47: warning: pointer ‘leaves_109’ may be used after ‘realloc’ [-Wuse-after-free]
  172 | #define FcOffsetToPtr(b, o, t)         ((t *)((uintptr_t)(b) + (ptrdiff_t)(o)))
      |                                               ^~~~~~~~~~~~~~

../src/fcfreetype.c:1723:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
 1723 |         canon_file = file;
      |                    ^

../src/fcfreetype.c:1723:20: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
 1723 |         canon_file = file;
      |                    ^

../src/fcxml.c:3334:13: warning: ignoring return value of ‘strerror_r’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
 3334 |             strerror_r (errno_, ebuf, BUFSIZ);
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../src/fcxml.c:3334:13: warning: ignoring return value of ‘strerror_r’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
 3334 |             strerror_r (errno_, ebuf, BUFSIZ);
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~