[testsuite] gcc.target/arm/pr42879.c: handle big-endian

[Janis Johnson]

Test gcc.target/arm/pr42879.c fails for big-endian multilibs.  Julian
Brown suggested this fix.

Tested on arm-none-eabi with several multilibs, checked in on trunk.

Janis

2012-09-26  Janis Johnson  <jani...@codesourcery.com>

        * gcc.target/arm/pr42879.c: Handle big-endian.

Index: gcc.target/arm/pr42879.c
===================================================================
--- gcc.target/arm/pr42879.c    (revision 191765)
+++ gcc.target/arm/pr42879.c    (working copy)
@@ -4,6 +4,9 @@
 
 struct A
 {
+#ifdef __ARMEB__
+  int dummy:31;
+#endif
   int v:1;
 };