b=16813
i=johann
i=panda
restore the ability to pass LD= through autoconf since x2 requires an
alternate LD program (x2ld).
because it can be accessed by reply_in_callback() without the
rq_lock held.
+Severity : normal
+Frequency : only X2
+Bugzilla : 16813
+Description: X2 build failures
+Details : fix build failures on Cray X2.
+
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