Merge PR #164 into 12.0

Signed-off-by StefanRijnhart

setup/base_external_dbsource_mysql/setup.py

@@ -2,5 +2,11 @@ import setuptools
 
 setuptools.setup(
     setup_requires=['setuptools-odoo'],
-    odoo_addon=True,
+    odoo_addon={
+        'external_dependencies_override': {
+            'python': {
+                'MySQLdb': 'mysqlclient==2.0.1',
+            }
+        },
+    }
 )