Add support for cpp files with test examples

Fix https://github.com/clearlinux/make-fmv-patch/issues/2

Signed-off-by: Victor Rodriguez <victor.rodriguez.bahena@intel.com>

tests/loop-test.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#define MAX 1000000
+
+static struct timeval tm1;
+int a[256], b[256], c[256];
+
+void foo();
+
+int main(){
+    foo();
+    return 0;
+}
+
+void foo(){
+    int i,x;
+    for (x=0; x<MAX; x++){
+        for (i=0; i<256; i++){
+            a[i] = b[i] + c[i];
+        }
+    }
+}
+
+