Adding some test cases for the pre-processor. (Total hack, requires copying and pasting code from the actual app source into another file and running a shell script, but it's better than nothing.)

app/preproc/test/data/foo6.cpp

@@ -0,0 +1,11 @@
+void setup()
+{
+}
+
+void loop()
+{
+}
+
+void foo(int x, int y, char *z)
+{
+}