firmware-utils: zyimage: drop POSIX SOURCE defines
This fixes:
src/zyimage.c:10:0: warning: "_POSIX_SOURCE" redefined
src/zyimage.c:11:0: warning: "_POSIX_C_SOURCE" redefined
This change has been tested on Linux with -Wextra and on Mac OS.
Signed-off-by: Rafał Miłecki <[email protected]>