otterlace_env.sh - take the Perl from otterlace_build

support precise-x86_64 edition of /software/anacode
  needed for RT#334916
but better than c69c47e9 on humpub-branch-74,
  don't add another dup "which Perl?" logic, take it from otterlace_build
  avoid breaking Mac build (already broken by XRemote on 74)
on PATH, Perl is promoted before pubseq EMBOSS (for convenience)
for Mac, make no reference to distro (is meaningless)
remove empty PERL5LIB element

requires team_tools >= otter/75_precise to build
5.14 - fix deprecation warning