* Update configure.ac bug URL for gitlab migration
* Fix spelling/wording issues
* gitlab CI: add a basic build test
* Variable scope reduction as recommended by cppcheck
* Mark two dpy parameters const as suggested by cppcheck
* XDamageCloseDisplay: Mark codes as unused
* Remove unnecessary casts from malloc() and free() calls
* Handle -Wconversion warnings from clang
* Handle -Wshorten-64-to-32 warnings from clang
OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/libXdamage?expand=0&rev=17
