testsuite: fix array type in two_plus_gigs test

The array element type for the two_plus_gigs test was mistakely put in
as int rather than char.


for  gcc/testsuite/ChangeLog

	* lib/target-supports.exp (check_effective_target_two_plus_gigs):
	Fix array element type.  Reported by Hans-Peter Nilsson.
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 48c5dda..4ed7b25 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -2909,7 +2909,7 @@
 
 proc check_effective_target_two_plus_gigs { } {
     return [check_no_compiler_messages two_plus_gigs executable {
-	int dummy[0x80000000];
+	char dummy[0x80000000];
 	int main () { return 0; }
     }]
 }