* Instead of creating the bsd.perl.mk file at build-time, create it at
install-time using the currently-installed perl executable. This change
forces that bsd.perl.mk PERL5_* variables to be consistent with the
version of the installed perl package, regardless of whether perl-mk is
installed as a binary package or not. This fixes a problem noted on
tech-pkg by manu@netbsd.org.
Another stab at speeding up recursive tree walks: Move perl
variables that depend on the installed version to a separate file,
so that some perl invocations only get done once per installation of
perl, not once per 'make' in pkgsrc.
