package/gtest: bump to version 1.11.0

package/gtest: bump to version 1.11.0

Python is removed as dependency.
gtest uses python for self-tests which are not run by buildroot,
and the remaining scripts are not used by the build, and aren't
maintained or supported.

Special handling for gtest-config and gmock-config is removed as well,
the CMake Buildsystem now does take care of those.

Signed-off-by: Norbert Lange <nolange79@gmail.com>
[Arnout: still install gmock_gen.py]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>