kbuild: uapi: reuse KBUILD_USERCFLAGS

The toplevel Makefile already provides the compiler flags necessary to
build target userspace applications. KBUILD_USERCFLAGS already
incorporates USERCFLAGS and -Wall, so drop those.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
1 file changed