[testsuite] Unsupport 20190827-1.c for targets without alias support.

gcc/testsuite/

2019-09-01  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.c-torture/compile/20190827-1.c: Add dg-requires-alias.

From-SVN: r275274

gcc/testsuite/ChangeLog

+2019-09-01  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* gcc.c-torture/compile/20190827-1.c: Add dg-requires-alias.
+
 2019-09-01  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc.c-torture/execute/20190901-1.c: New test.

gcc/testsuite/gcc.c-torture/compile/20190827-1.c

+/* { dg-require-alias "" } */
 typedef unsigned char __u8;
 typedef __u8 u8;
 typedef u8 u_int8_t;