build_core: add lockfile removal for git

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2758 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
Initial work for supporting WL session types that use the fullscreen-shell in a weston host

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2759 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
waylandloginmanager: More support for WL sessions

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2760 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
add a WL test session for waylandloginmanager

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2761 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
westonlaunchcaller: don't leak WAYLAND_HOST when there is no wayland host

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2762 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
westonlaunchcaller: document the support for calling the host servers

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2763 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
waylandloginmanager: Support exporting session backend information about how to execute the host weston server. 

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2764 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9
westonlaunchcaller: Handle calling weston with the approriate backend with the exported information

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@2765 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9