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Allow variables with same name of typedef of external contexts

It is legal a code like:

	typedef int pepe;

	main()
	{
		int pepe;
	}

So, we have to detect when we already have a type in the declaration
and don't generate an error when we get a TYPENAME in this case. It
is also necessary add a new rule in directdcl in order to allow
create a new symbol from the string of a TYPENAME.

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -68,12 +68,13 @@

 		dp = declarator0(dp, flags);

 		expect(')');

 	} else if (flags) {

-		if (yytoken != IDEN) {

-			if (flags & ID_EXPECTED)

-				unexpected();

-			sym = install("", NS_IDEN);

-		} else {

+		if (yytoken == IDEN ||

+		    yytoken == TYPE && yylval.token == TYPENAME) {

 			sym = newiden();

+		} else if (flags & ID_EXPECTED) {

+			unexpected();

+		} else {

+			sym = install("", NS_IDEN);

 		}

 		dp->op = IDEN;

 		dp->u.sym = sym;

@@ -186,6 +187,8 @@

 			case STRUCT: case UNION:

 				dcl = structdcl; p = &type; break;

 			case TYPENAME:

+				if (type)

+					goto check_types;

 				tp = yylval.sym->type;

 			case VOID:   case BOOL:  case CHAR:

 			case INT:    case FLOAT: case DOUBLE: