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[cc1] Allow conversions between pointers to equivalent types

This is explicitly allowed by the standard, and it makes sense.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -292,7 +292,8 @@

 				return NULL;

 			break;

 		case PTR:

-			if (iscast ||

+			if (eqtype(newtp, oldtp, 1) ||

+			    iscast ||

 			    newtp == pvoidtype || oldtp == pvoidtype) {

 				np->type = newtp;

 				return np;