[qfcc] Add a new failing test

The struct alias is somehow blocking the detection of the call so the
return value gets corrupted.

tools/qfcc/test/func-expr2.r

@@ -0,0 +1,23 @@
+typedef struct Extent_s {
+	int width;
+	int height;
+} Extent;
+
+extern Extent get_size (void);
+extern int getlen(void);
+
+int main (void)
+{
+	int x = get_size().width - getlen() - 1;
+	return x != 29;
+}
+
+Extent get_size (void)
+{
+	return {38, 8};
+}
+
+int getlen (void)
+{
+	return 8;
+}