Issue with version number generation

[Thermi]

Hi,

The code generating the version number from the git repo is broken in a special way:
Even if the libkcoidc source code is not a git repo itself but is in a subdirectory of one, it generates the version number based on that one. Even if the .version file is created before configure is run, it does that. If that git repo is "dirty" it appends the -dirty suffix to the version number. When it then generates the pkg-config file, its Version field contains a version number with the -dirty suffix, which is not good, because the best practice for it is to only contain a decimal and dotted version number, without alphabetical characters.