Merge branch 'mkenums-once' into 'master'
authorEmmanuele Bassi <ebassi@gmail.com>
Tue, 21 May 2019 16:42:05 +0000 (16:42 +0000)
committerEmmanuele Bassi <ebassi@gmail.com>
Tue, 21 May 2019 16:42:05 +0000 (16:42 +0000)
Use g_once for all the mkenums template files

Closes #1617

See merge request GNOME/gtk!865


Trivial merge