kconfig: variable argument lists needs `stdarg.h'
kconfig: variable argument lists needs `stdarg.h'

Fix build on non GNU based platforms.

Cc: Roman Zippel <f9f6ad990b4a8c1974dc6544787c1cc3570b6f00@linux-m68k.org>
Signed-off-by: Sam Ravnborg <f16bed56189e249fe4ca8ed10a1ecae60e8ceac0@ravnborg.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas