Do not build the base archive for android platform.

We already have a base archive per android_<arch> platform.
We don't need to create another archive that will mainly include the
content of the other archives.

travis/compile_all.py

@@ -324,6 +324,7 @@ if PLATFORM != 'flatpak':
                         f.extractall(str(HOME))
                 except URLError:
                     pass
+        else:
             run_kiwix_build('alldependencies', platform=PLATFORM)
             make_deps_archive(name=base_dep_archive_name, full=True)