Allows fixing compilation with at least mariadb.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Passing DESTDIR is not needed with cmake packages.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

CMake supports Ninja for faster compilation and less bugginess when it
comes to parallel compilation. That is, some CMake packages currently
have PKG_BUILD_PARALLEL set where it is not needed with ninja.

Signed-off-by: Rosen Penev <rosenp@gmail.com>