Fix for cross-compilation issues

["Eric W. Anderson" <andersoe () cs cmu edu>]

Hi All,

I ran into trouble cross-compiling wirshark/tshak for ARM.  It looks
like the same issues from https://www.wireshark.org/lists/wireshark-users/200910/msg00121.html 
and https://www.wireshark.org/lists/wireshark-dev/201104/msg00135.html :
Host-side tools (lemon) were being compiled with the cross-compiler, and
then didn't work later in the build process. 

I believe the problem is that CC_FOR_BUILD was never being properly set
and ultimately got defaulted to $CC.  The fix is basically a 2-line change
to configure.ac, and including the macro ax_prog_cc_for_build.m4 in
aclocal-fallback/.  Should I submit a change for code review, or how is that
handled?

Thanks,
Eric


-- 
Eric W. Anderson                             Computer Science Department
andersoe () cs cmu edu                           Carnegie Mellon University
phone: +1-412-268-1908                        Gates-Hillmann Center 6005

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