Add missing stdio.h include. Without this includes, the build fails
with the following error under GCC 14.x:
../../../com32/lib/syslinux/debug.c: In function ‘syslinux_debug’:
../../../com32/lib/syslinux/debug.c:91:5: error: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
91 | printf("Dynamic debug unavailable\n");
Signed-off-by: Lance Fredrickson <lancethepants@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
