configure: support conditional compile of efl and extensions
Add --[disable|enable]-efl-tests to allow user to conditionally
compile the efl tests. Without an explicit option specified by
the user, then autodetect whether efl tests can be compiled.
Add --[disable|enable]-weston-extensions to allow the user to
conditionally compile the weston wfits extension. Without an
explicit option specified by the useer, then autodetect whether
the weston extensions can be compiled.
Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>