[testsuite]: Skip tests for targets with int < 32 bits

[Georg-Johann Lay]

This patch fixes testsuite failures because the testcases assume
sizeof(int) >= 4.

        * gcc.c-torture/compile/pr49029.c: Add dg-require-effective-target
        int32plus
        * gcc.c-torture/compile/pr49163.c: Ditto.

Index: gcc.c-torture/compile/pr49029.c
===================================================================
--- gcc.c-torture/compile/pr49029.c	(Revision 174701)
+++ gcc.c-torture/compile/pr49029.c	(Arbeitskopie)
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target int32plus } */
 /* PR middle-end/49029 */
 struct S { volatile unsigned f : 11; signed g : 30; } __attribute__((packed));
 struct T { volatile struct S h; } __attribute__((packed)) a;
Index: gcc.c-torture/compile/pr49163.c
===================================================================
--- gcc.c-torture/compile/pr49163.c	(Revision 174701)
+++ gcc.c-torture/compile/pr49163.c	(Arbeitskopie)
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target int32plus } */
 /* PR target/49163 */
 struct S1
 {