git: use make flags for all make calls

Rather than have the default stdenv builder call `make` with one set of
flags, then call `make` with a variety of other flags in the postBuild
and postInstall phases, build the same list of flags as the stdenv build
script, then use that flag list as an argument to calls to make.

This means the flags are more consistent across all calls.  In
particular, that means the documentation build doesn't fail because it
doesn't have PERL_PATH set when building Git v2.49.0-rc0.  It also means
more build steps are run using as many cores as are available for the
main build stages, and the install stages control their parallelism with
consistent use of the `enableParallelInstalling` flag (which is now also
enabled).

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