version number option

[Daniel Convissor]

Hi:

m4 is missing a command line option for getting the version, such as -v 
and/or --version.

I came across this issue while trying to build curl on FreeBSD 5.4.  The 
buildconf scirpt checks for m4 by doing "m4 --version".  It chokes at that 
point.  So, it'd be really nice if both a -v and --version option could be 
put in please.  The latter is the flag used by the other GNU build related 
programs.

Thanks,

--Dan

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