metadata: remove git repo handling from metadata parsing

This is a vestige of implementing builds from a .fdroid.yml file directly
in the app's source repo.  It was never fully complete and seems to not be
used in any apps in fdroiddata.  This makes `fdroid build --all` runs much
faster since it does not need to do any git handling for apps that do not
have any new builds to run.

4e8e29794
948689281
a4e431080
e37be9b06
e775d330c

examples/fdroid_fetchsrclibs.py

@@ -21,12 +21,14 @@ def main():
     options = parser.parse_args()
     common.options = options
     pkgs = common.read_pkg_args(options.appid, True)
-    allapps = metadata.read_metadata(pkgs, check_vcs=True)
+    allapps = metadata.read_metadata(pkgs)
     apps = common.read_app_args(options.appid, allapps, True)
     srclib_dir = os.path.join('build', 'srclib')
     os.makedirs(srclib_dir, exist_ok=True)
     srclibpaths = []
     for appid, app in apps.items():
+        vcs, _ignored = common.setup_vcs(app)
+        vcs.gotorevision('HEAD', refresh=False)
         for build in app.get('Builds', []):
             for lib in build.srclibs:
                 srclibpaths.append(common.getsrclib(lib, srclib_dir, build=build))