[gobject-introspection] (5 commits) Non-fast-forward update to branch tools.windows

[Chun-wei Fan <fanchunwei src gnome org>]

The branch 'tools.windows' 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:

  e0be419... g-ir-tool-template.in: Don't hardcode /usr/bin/env
  9b6513b... Revert "scanner: remove some unnecessary Windows includes"
  dadde7b... Revert "scanner: remove hacks to make mingw g-i work with m

Commits added to the branch:

  897b1ce... MSVC.README.rst: Be more clear on Python requirements (*)
  7378ded... Merge branch 'tools.windows' into 'master' (*)
  2c6b3b9... g-ir-tool-template.in: Don't hardcode /usr/bin/env
  032eac5... Revert "scanner: remove some unnecessary Windows includes"
  2a6fc83... Revert "scanner: remove hacks to make mingw g-i work with m

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