Allow compilation with native GNU make and cmd only #119
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Use a character which mustn't be used elsewhere in the file.
Available since GNU make 4.0 (Oct 2013)
Avoid the use of sed when building Compat.ml and use the NUL device.
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These commits combine with some other work of mine which allow OCaml to be compiled using native GNU make (e.g. from ezwinports) and no Cygwin installation.
The bulk of the change consists of allowing
Compat.mlto be generated without needingsedortestand requiring 2013's GNU make 4.0 to be able to use$(file ..)to generateversion.mlwithout resorting to chains ofechocommands.