Add support for Arch to module_utils.basic.py

Fixes ansible/ansible#8653

lib/ansible/module_utils/basic.py

@@ -181,7 +181,8 @@ def get_distribution():
     ''' return the distribution name '''
     if platform.system() == 'Linux':
         try:
-            distribution = platform.linux_distribution()[0].capitalize()
+            supported_dists = platform._supported_dists + ('arch',)
+            distribution = platform.linux_distribution(supported_dists=supported_dists)[0].capitalize()
             if not distribution and os.path.isfile('/etc/system-release'):
                 distribution = platform.linux_distribution(supported_dists=['system'])[0].capitalize()
                 if 'Amazon' in distribution: