clutter: further improvements

clutter: further improvements

 * Removed unnecessary gtk-doc related depends/configure options (handled in
   gtk-doc class),
 * Moved more configure options into PACKAGECONFIG,
 * Fixed missing comma in PACKAGECONFIG[glx] setup,
 * Removed no longer required DOLT-related config fragment.

(From OE-Core rev: a5d9c80fa35e9fd234f14c61b385d9c17f31132b)

Signed-off-by: Tomas Frydrych <tomas@sleepfive.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>