Commit: Add RX port

[Peter Bergner]

Nick and DJ,

After your checkin of the RX port here:

  http://sourceware.org/ml/binutils/2009-09/msg00696.html

whenever I do a regtest build using:

  -target=powerpc-linux --host=powerpc-linux --build=powerpc-linux --enable-targets=all

I notice that ${SRC}/opcodes/rx-decode.c gets updated even though I
haven't touched anything to do with RX...or anything for that matter.
All of the changes look like new #line numbers in the file, like so:

-#line 2 "/work/sources/binutils/current/opcodes/rx-decode.opc"
+#line 2 "/home/bergner/binutils/binutils-476-cvs/opcodes/rx-decode.opc"

Is this really to be expected now?  I see this on the 2.20 branch too.

Peter