Add a specific test for old C89 features that were removed from C99+.

Tests/Conformance/DOIT3

@@ -1,3 +1,4 @@
+{1} c89oldfeat.c
 {1} c95digraph.c
 {1} c95iso646.c
 {1} c99fam.c

Tests/Conformance/c89oldfeat.c

@@ -0,0 +1,31 @@
+/*
+ * Test old features from C89/C90 that have been removed or deprecated in C99+.
+ */
+
+int printf(const char *, ...);
+
+#define M+4             /* no whitespace after macro name */
+
+main ()                 /* implicit int, no prototypes */
+{
+        auto i,j;       /* implicit int */
+        
+        j = M;
+        i = (const) j;  /* implicit int */
+        i = (volatile) j;
+        
+        if (f(i) == 8)  /* calling undeclared function */
+        {
+                printf ("Passed Conformance Test c89oldfeat\n");
+                return 0;
+        };
+        
+        printf ("Failed Conformance Test c89oldfeat\n");
+        return;         /* return no value from a function returning int */
+}
+
+f(x)                    /* implicit int, no prototypes */
+                        /* implicit int parameter x */
+{
+        return x * 2;
+}