Remove git from depends, because it isn't needed when building the
manuals from a source tarball. Avoid having git in the build
dependencies of the upcoming manuals packaging for debian.
Related: OS#3899
Change-Id: I46ad818a1d009c03357821f7c8100ecb5d62962e
Make it possible to run the dependency check without the Makefile. This
is needed to split up the manual pages into the projects repositories,
so we can call check-depends.sh from there.
Related: OS#3385
Change-Id: I82a7efd7e9c265c82d1ba8a60856c892a15a7a33