Log Message:
Update to 0.81

Upstream changes:
0.81 Sun 03 Feb 2019 04:42:05 PM CET
 - Regular release, see developer releases

0.80_03 Fri 01 Feb 2019 11:26:18 PM CET
 - Fix @inc, add another exception for Inline::C (SISYPHUS++)

0.80_02 Fri Jun 22 22:21:11 MDT 2018
 - Revert PR/61 - failed on travis

0.80_01 Fri Jun 22 21:39:49 MDT 2018
 - PR/59 @pypt++ Travis test against Perl 5.22, 5.24, 5.26
 - PR/60 @pypt++ Calculate MD5 hashes of UTF-8 source by encoding it first
 - PR/61 @rurban++ Fix wrong -I in subcmd
 - PR/66 @soren++ Fix failing tests on systems missing perldiag.pod
 - PR/67 NERDVANA++ Relax the version requirement for installing modules

0.80 Fri Mar 13 20:03:52 PDT 2015
 - Fix dependency problem in Inline::MakeMaker affecting parallel builds