[gcr] (6 commits) Non-fast-forward update to branch wip/smcv/python3

[Simon McVittie <smcv src gnome org>]

The branch 'wip/smcv/python3' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  a0f8563... Use python3 shebang in ui/icons/render-icons.py

Commits added to the branch:

  1479bda... configure: Use PKG_PROG_PKG_CONFIG instead of reinventing i (*)
  9ca4e1b... configure: Run $PKG_CONFIG instead of hard-coding pkg-confi (*)
  a26b7a2... Merge branch 'wip/smcv/cross-friendly-pkg-config' into 'mas (*)
  21384bd... gcr-prompt-dialog: Allow the use of mnemonics in the choice (*)
  015d576... Merge branch 'wip/smcv/mnemonics' into 'master' (*)
  0629160... Use python3 shebang in ui/icons/render-icons.py

(*) This commit already existed in another branch; no separate mail sent