Add GNUmakefile for cross-compilation use
Detail: HdrSrc is such an unusual component that the only shared makefile fragment it uses is StdTools. Almost every line requires edits to accommodate the differences between amu and GNU make, so for clarity we use separate makefiles for the two tools. Admin: I'd forgotten that I'd created the XCompile branch a few years back until just now! I think this is a superior solution because it confines the changes to a single file, at least in the short-term. Version 2.74. Tagged as 'HdrSrc-2_74'
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