test: added some comments to funcdef.st and funcdefShadowGlobal.st

test/compiler/funcdef.st

@@ -16,8 +16,7 @@ void *f1a()
     return 0;
 }
 
-/* forward declarations */
-void *f2(void *x, double **d);
+/* forward declarations (not needed but allowed) */
 void pvSetX(int val);
 
 ss simple {

test/compiler/funcdefShadowGlobal.st

@@ -7,7 +7,7 @@ assign x;
 
 void pvSetX(int x)
 {
-    pvPut(x);
+    pvPut(x); /* error: parameter 1 to 'pvPut' was not assigned to a pv */
 }
 
 ss simple {