Remove some customizations from the perl build

This was originally done so that other things in-tree such as vi could link
to libperl and to support non-shared vax.

This brings us more in-line with

Remove some customizations from the perl build

This was originally done so that other things in-tree such as vi could link
to libperl and to support non-shared vax.

This brings us more in-line with upstream and makes things more understandable.

It now links libperl.so to libm, which some software needs, and stops building
and installing libperl.a.

OK bluhm@

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We have a copy of git_version.h in src so that we can build libperl
with out own rules but apparently this causes problems after
git_version.h is generated in the obj dir. This will only ever be
a s

We have a copy of git_version.h in src so that we can build libperl
with out own rules but apparently this causes problems after
git_version.h is generated in the obj dir. This will only ever be
a stub as we build from a release, not a git checkout. Add a
pre-generated lib/Config_git.pl and prevent git_version.h and
Config_git.pl from being removed by the clean target.
Appears to fix parallel make issues. OK oga@

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