Merge branch 'ab/simplify-perl-makefile' into next

The build procedure for perl/ part has been greatly simplified by
weaning ourselves off of MakeMaker.

* ab/simplify-perl-makefile:
perl: treat PERLLIB_EXTRA as an extra path again
perl: avoid *.pmc and fix Error.pm further
Makefile: replace perl/Makefile.PL with simple make rules

diff --cc Makefile
Simple merge

diff --cc git-send-email.perl
Simple merge

diff --cc perl/Git.pm
Simple merge

diff --cc t/perf/aggregate.perl
index 5c439f6bc23e782e09924c02abe3d4edc4cd0d03,923044df6a0ace8870c83eee5ce1de6fba682b28..3a0917fa61ef6e630ca4dc2bb28c2af671f98804
--- 1/t/perf/aggregate.perl
--- 2/t/perf/aggregate.perl
+++ b/t/perf/aggregate.perl
@@@ -1,9 -1,8 +1,9 @@@
  #!/usr/bin/perl
  
- use lib '../../perl/blib/lib';
+ use lib '../../perl/build/lib';
  use strict;
  use warnings;
 +use JSON;
  use Git;
  
  sub get_times {

diff --cc t/test-lib.sh
Simple merge