package/efl/expedite: x-includes and x-libraries must be set for cross-compiling

If those flags are not explicitly passed, the libecore configure
script will include -I/usr/X11R6/include and -L/usr/X11R6/lib in the
compile flags, which are obviously unsafe for cross-compilation.

The fix is similar to 0d9d8984 and
da50b6b6.

Fixes:
http://autobuild.buildroot.org/results/24b/24b578a28455409b7bcc0277abc6b478c51ae67f



Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>