nvmutil: remove memcmp/memcpy/strrchr/rename

i had this idea in my head of later porting this
to k&r c for fun. but screw it.

compiling on everything since 1989 is enough

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/nvmutil/lib/state.c

@@ -236,7 +236,7 @@ getnvmprogname(void)
 		rval = x->argv0;
 	}
 
-	p = x_c_strrchr(rval, '/');
+	p = strrchr(rval, '/');
 
 	if (p)
 		return p + 1;