Merge branch 'master' into 'master'

add mariadb-connector-c

See merge request codechina/mirrors-settings!488

projects/mariadb-corporation/imports.yml

+---
+group:
+  name: 'mariadb-corporation'
+  description: ''
+  projects:
+  - name: 'mariadb-connector-c'
+    description: 'MariaDB Connector/C is used to connect applications developed in C/C++ to MariaDB and MySQL databases.The client library is LGPL licensed.'
+    mirrorRelease: false
+    topic: 'mariadb'
+  
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