Add prototype adding test for static functions

Static functions should not get a prototype added, since ctags does not
allow generating the correct prototype.

Signed-off-by: Matthijs Kooijman <[email protected]>

Author: matthijskooijman

src/arduino.cc/builder/test/sketch_with_complex_prototypes/sketch.ino

@@ -16,3 +16,7 @@ __attribute__((always_inline)) uint8_t testAttribute() {
 void testDefault(int x = 1) {
 
 }
+
+static void testStatic() {
+
+}