Fixes the following -Werror warnings with C89_BUILD=1 and clang.
gfx/common/x11_common.c:407:17: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement]
Status status = 0;
^
libretro-common/formats/libchdr/chd.c:639:12: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement]
uint8_t *sector = &dest[framenum * CD_FRAME_SIZE];
^
libretro-common/formats/libchdr/chd.c:723:12: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement]
uint8_t *sector = &dest[framenum * CD_FRAME_SIZE];
^