- fix undefined reference to `__sync_val_compare_and_swap_4' on hppa

Index: gettext-tools/gnulib-lib/asyncsafe-spin.c
--- gettext-tools/gnulib-lib/asyncsafe-spin.c.orig
+++ gettext-tools/gnulib-lib/asyncsafe-spin.c
@@ -138,7 +138,7 @@ do_unlock (asyncsafe_spinlock_t *lock)
 #  elif (((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) \
           && !defined __sparc__) \
          || __clang_major__ >= 3) \
-        && !defined __ibmxl__
+        && !defined __ibmxl__ && !defined(__hppa__)
 /* Use GCC built-ins (available in GCC >= 4.1, except on SPARC, and
    clang >= 3.0).
    Documentation: