Don't check for atomic_ops library for now.

(Logical change 1.283)
diff --git a/acinclude.m4 b/acinclude.m4
index 9c15af1..497f7c2 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -22,5 +22,11 @@
 AC_DEFUN([CHECK_ATOMIC_OPS],
 [dnl Check whether the system has the atomic_ops package installed.
   AC_CHECK_HEADERS(atomic_ops.h)
-  AC_CHECK_LIB(atomic_ops, main)
+#
+# Don't link against libatomic_ops for now.  We don't want libunwind
+# to depend on libatomic_ops.so.  Fortunately, none of the platforms
+# we care about so far need libatomic_ops.a (everything is done via
+# inline macros).
+#
+#  AC_CHECK_LIB(atomic_ops, main)
 ])