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Implement #undef

Undef only undefined an already defined macro.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -460,8 +460,18 @@

 		error("#else without #if");

 	cleanup(s);

 	cppoff += (ifstatus[numif-1] ^= 1) ? -1 : 1;

+}

-	return;

+static void

+undef(char *s)

+{

+	Symbol *sym;

+

+	if (!iden(&s))

+		error("#undef must have an identifier as parameter");

+	sym = lookup(NS_CPP);

+	sym->flags &= ~ISDEFINED;

+	cleanup(s);

 }

 bool

@@ -477,6 +487,7 @@

 		"ifndef", ifndef,

 		"endif", endif,

 		"else", elseclause,

+		"undef", undef,

 		"line", line,

 		"pragma", pragma,

 		"error", usererr,