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Give better message errors in preprocessor

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -515,7 +515,7 @@

 	struct ifstatus *ip;

 	if (cppctx == 0)

-		error("#else without #if");

+		error("#else without #ifdef/ifndef");

 	cleanup(s);

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

 }

@@ -526,7 +526,7 @@

 	Symbol *sym;

 	if (!iden(&s))

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

+		error("no macro name given in #undef directive");

 	sym = lookup(NS_CPP);

 	sym->flags &= ~ISDEFINED;

 	cleanup(s);