Add 4th parameter to clone_source() helper for checking out specific commit.
It will clone the given branch (but with full depth) and then checkout
the given commit.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Add a github workflow that builds the Xservers on Linux and also
runs build-test of several common drivers against xorg sdk.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
