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cc1: Improve errors in typedef'ed function types

If a typedef function type is used to define a function we should
give a clear error messae and try to don't break any assumption
that the code does.

--- a/src/cmd/cc/cc1/decl.c

+++ b/src/cmd/cc/cc1/decl.c

@@ -1,3 +1,4 @@

+#include <assert.h>

 #include <stdarg.h>

 #include <stdlib.h>

 #include <string.h>

@@ -505,8 +506,16 @@

 	case TYPE:

 	case SCLASS:

 	case TYPEIDEN:

+		if (curctx < PARAMCTX) {

+			assert(!pars);

+			errorp("typedef'ed function type cannot be instantiated");

+			curctx = PARAMCTX;

+			pars = (Symbol *[]) {NULL};

+		}

+

 		if (curctx != PARAMCTX)

 			errorp("nested function declaration");

+

 		if (sym && sym->ns == NS_IDEN)

 			break;

 	default: