Fix build failure on CentOS 7, setting TARGET=generic until we devise a
better setting.
Update to 3.1.2:

This is a regularly-scheduled bugfix release.

    commit: catch changed exec bit on files from p1 (issue4382)
    diff: document the nobinary option
    dispatch: check shell alias again after loading extensions (issue4355)
    dispatch: make "_checkshellalias" reusable regardless of adding aliases
    help: fix typo in log examples
    help: mention mode in hg log --removed help (issue4381)
    hgweb: fail if an invalid command was supplied in url path (issue4071)
    hgweb: refresh hgweb.repo on phase change (issue4061)
    histedit: abort gracefully on --continue/--abort with no state
    keepalive: fix how md5 is used
    mq: examine "pushable" of already applied patch correctly
    mq: pop correct patches when changing pushable-ness of already applied ones
    mq: report correct numbers for changing "number of guarded, applied patches"
    mq: use "mq.applied[i].name" instead of "mq.appliedname(i)" for safety
    revset: add an optimised baseset.contains (issue4371)
    templater: fix precedence of --style and --template options
Updated devel/py-mercurial to 3.1.2
Add another patch, welcome to 4.3.29. Not sure if this is hardening or
a vulnerability.
Updated shells/bash to 4.3.029