README: Mention how to cross-compile

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 Documentation
 -------------
 
+In order to cross-compile the generated source, modify the "Make
+command" in Code Generation pane to set the CC variable (and/or CPP
+for C++ compiler). For example:
 
+    make_rtw CC=arm-linux-gnueabi-gcc
 
 Pointers to more ERT Linux target documentation can be found at the
 project SourceForge page http://lintarget.sourceforge.net/.