[gobject-introspection] (6 commits) Non-fast-forward update to branch wip/smcv/search-paths

[Simon McVittie <smcv src gnome org>]

The branch 'wip/smcv/search-paths' 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:

  63666d6... Python tools: Don't prepend /usr/share to the search path f
  ee39338... Add GI_GIR_PATH environment variable
  6742a09... build: Leave gir_dir_prefix unexpanded
  58d6459... giscanner: Search the same hard-coded GIR_DIR used for the 
  cb71945... girepository: Search the same paths as the Python code
  af3c5d5... Search XDG_DATA_HOME/gir-1.0 for GIR XML too

Commits added to the branch:

  8c89510... Python tools: Don't prepend /usr/share to the search path f
  913cf3c... Add GI_GIR_PATH environment variable
  a06edfb... build: Leave gir_dir_prefix unexpanded
  11574d9... giscanner: Search the same hard-coded GIR_DIR used for the 
  789cacb... girepository: Search the same paths as the Python code
  b358642... Search XDG_DATA_HOME/gir-1.0 for GIR XML too