libXdamage 1.1.6

• Update configure.ac bug URL for gitlab migration
• Build xz tarballs instead of bzip2
• 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