cpuid util fix for build warning

Bug: libyuv:747
Test: mm cpuid under android builds
Change-Id: I7fff13006b47a59873f29f8992bb3faf9bdb85f1
Reviewed-on: https://chromium-review.googlesource.com/727263
Commit-Queue: Frank Barchard <fbarchard@google.com>
Reviewed-by: Frank Barchard <fbarchard@google.com>

util/cpuid.c

@@ -22,6 +22,9 @@ int main(int argc, const char* argv[]) {
   int has_arm = TestCpuFlag(kCpuHasARM);
   int has_mips = TestCpuFlag(kCpuHasMIPS);
   int has_x86 = TestCpuFlag(kCpuHasX86);
+  (void)argc;
+  (void)argv;
+
 #if defined(__i386__) || defined(__x86_64__) || \
     defined(_M_IX86) || defined(_M_X64)
   if (has_x86) {