libstatgrab: Update to 0.92

libstatgrab: Update to 0.92

- Update from 0.91 to 0.92
- Update of rootfile
- Changelog
   2019-07-16  Tim Bishop  <tim@bishnet.net>
      Fix build/install of manpages.
      This defaults to attempting to install manpages, unless --disable-man is
      given to stop it. It defaults to not building the manpages, unless it
      finds docbook2man to build them with.
      So for users of the release tarball this will install the manual pages
      from the tarball, unless requested not to.
      For users of the git repository it will error if they don't have
      docbook2man, unless they choose to disable manual pages. I think this is
      reasonable because docbook2man is a required tool for build from source.
    Files affected:
      configure.ac
      docs/libstatgrab/Makefile.am
      docs/saidar/Makefile.am
      docs/statgrab/Makefile.am
   2019-07-15  Tim Bishop  <tim@bishnet.net>
      Allow version to be overridden.
      By default, it still uses the short version of the commit reference.
      This is most useful for normal CI builds so you can easily see which
      commit a tarball is made from. But when testing for a release one might
      want to specify the version explicitly, so this can now be overridden by
      manually triggering a build and setting LSG_VERSION (eg. 0.92).
    Files affected:
      .gitlab-ci.yml

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>