Add missing pkgconfig(glib-2.0) dep
    
    Traceback when building other modules:
    
    Traceback (most recent call last):
      File "/usr/bin/gtkdoc-rebase", line 56, in <module>
        sys.exit(rebase.run(options))
      File "/usr/share/gtk-doc/python/gtkdoc/rebase.py", line 66, in run
        dir = common.GetModuleDocDir('glib-2.0')
      File "/usr/share/gtk-doc/python/gtkdoc/common.py", line 104, in GetModuleDocDir
        path = subprocess.check_output([config.pkg_config, '--variable=prefix', module_name], universal_newlines=True)
      File "/usr/lib64/python2.7/subprocess.py", line 219, in check_output
        raise CalledProcessError(retcode, cmd, output=output)
    subprocess.CalledProcessError: Command '['/usr/bin/x86_64-redhat-linux-gnu-pkg-config', '--variable=prefix', 'glib-2.0']' returned non-zero exit status 1