add fix test results for irix_limits_const hack

From-SVN: r42639

gcc/fixinc/tests/base/fixinc-test-limits.h

+/*  DO NOT EDIT THIS FILE.
+
+    It has been auto-edited by fixincludes from:
+
+	"fixinc/tests/inc/fixinc-test-limits.h"
+
+    This had to be done to correct non-standard usages in the
+    original, manufacturer supplied header file.  */
+
+
+
+#if defined( IRIX_LIMITS_CONST_CHECK )
+extern __const char limit; /* test limits */
+#endif  /* IRIX_LIMITS_CONST_CHECK */