PolicyKit: Changes to 'wip/mozjs17'

[Colin Walters]

New branch 'wip/mozjs17' available with the following commits:
commit 637c9918ddc14968cd701a40d69b3bd257e75b95
Author: Colin Walters <walters at verbum.org>
Date:   Fri Apr 12 12:29:07 2013 -0400

    build: Look for mozjs17 too

commit 1918a056c320dbf6728131d586698a214fed28dd
Author: Colin Walters <walters at verbum.org>
Date:   Fri Apr 12 12:03:51 2013 -0400

    Revert "Dynamically load libmozjs185.so and cope with it not being available"
    
    The new plan is to hard-require JS.  See discussion in
    https://bugs.freedesktop.org/show_bug.cgi?id=59830
    
    This reverts commit 34cb6353b9affd6c04ea480df5fc39d0ca72319d.
    
    Conflicts:
    	src/polkitbackend/polkitbackendjsauthority.c