ostbuild: Minor cleanups
3.6: Drop mesa patches; all have equivalent upstream fixes
Move ostbuild to src/

This fixes the build when srcdir == builddir, because the name
"ostbuild" was both a directory and a binary.
3.6: Add gnome-ostree (it's recursive!)
3.6: Add at-spi2-core and at-spi2-atk
Add qa/repoweb

This is a basic web page that can load current status data via AJAX.
The data is generated via "ostbuild repoweb-data data.json".
3.6: Drop folks for now

The zeitgeist dependency brings in too much crap (xapian, etc.)
ostbuild: Don't ship .pyc, .pyo files

They contain embedded timestamps which means they change at every
build.  This bloats diffs unnecessarily.
3.6: Catch up with libgweather status from jhbuild
ostbuild: Add log message containing component JSON
3.6: Add libsecret, needed by latest gnome-online-accounts
3.6: Add --disable-documentation for gvfs
3.6: Drop mesa to a stable tag, builds break too often
build: Print out git log on build failure
3.6: Rebase udisks documentation patch
source-diff: Use generic mode switch
ostbuild: Avoid using python global statement

I'm not sure how this ever worked...running into some problems with it
now.
3.6: Rebase GDM patch stack
3.6: Drop upstreamed gdm patch stack
build: Sync up warning CFLAGS with ostree