Use GL ES 2 on desktop.

Use GL ES 2 on desktop.

Switch desktop build to use OpenGL ES 2.
This will make it use common rendering path with phone and a lot of graphics
features would be easier to develop.

Requires install additional ubuntu package and rebuild of dependencies.

To make it work do:

sudo apt-get install libgles2-mesa-dev
rm -rf out.x64/Dependencies/jhbuild.stamp out.x64/Dependencies/Root
./build/build_desktop.sh --debug

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=5599

Change-Id: I10b67a7c8f11f6800cffd8ed1454ecc6561fb45a
Signed-off-by: Viatcheslav Ostapenko <sl.ostapenko@samsung.com>