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Fix static initializers

Static initializers can be only initialized by
constant expressions, and the static types we
have are GLOBAL, LOCAL and PRIVATE (static
with global context, function context and
file context).

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -1186,7 +1186,7 @@

 	np = assignop(OINIT, varnode(sym), np);

-	if ((flags & (ISEXTERN|ISTYPEDEF)) != 0) {

+	if ((flags & (ISGLOBAL|ISLOCAL|ISPRIVATE)) != 0) {

 		if (!np->right->constant)

 			errorp("initializer element is not constant");

 		emit(OINIT, np);

@@ -1196,5 +1196,5 @@

 	} else {

 		np->op = OASSIGN;

 		emit(OEXPR, np);

-	}	

+	}

 }