Log Message:
Update irrtoolset5 to version 5.1.2.

Pkgsrc changes:
 * Project moved to github, follow suit.
 * Use the pre-configure target to run the required autotools
 * Remove ancient GCC_REQD+=3.0
 * Add use of more autotools
 * Fix up PLIST with share/doc/irrtoolset/ files.

Upstream changes:

New Features
 * initial support for IOS XR in rtconfig
 * IOS support for peer templates (-cisco_peer_templates)
 * support of community.delete on Cisco IOS
 * implement importPeerGroup for JUNOS

Bug Fixes
 * better asn32 support on JUNOS
 * fix JUNOS output so it can be deployed using "load replace" \ 
(-junos_replace)
 * several toolchain bugfixes (bison 2.x, gcc)
 * workaround for compiler optimisation bug in gcc6
 * permit community values starting with 0:
 * updates for autotools

Other Notes
 * Solaris no longer formally supported
 * delete bugs/, contrib/ and tests/ directories
 * added Travis CI support

We'd like to thank ISC for their continued support and the small
but important army of contributors who made this release possible.