update mysql to reduce its size

library/mysql

@@ -1,6 +1,6 @@
 # maintainer: InfoSiftr <[email protected]> (@infosiftr)
 
-latest: git://github.com/docker-library/docker-mysql@33cd238de569ae0909f940c2d7f2b1430e866171
-5: git://github.com/docker-library/docker-mysql@33cd238de569ae0909f940c2d7f2b1430e866171
-5.6: git://github.com/docker-library/docker-mysql@33cd238de569ae0909f940c2d7f2b1430e866171
-5.6.17: git://github.com/docker-library/docker-mysql@33cd238de569ae0909f940c2d7f2b1430e866171
+latest: git://github.com/docker-library/docker-mysql@a63bd99cbf39d5965d7e59e362aea330fcfe014a
+5: git://github.com/docker-library/docker-mysql@a63bd99cbf39d5965d7e59e362aea330fcfe014a
+5.6: git://github.com/docker-library/docker-mysql@a63bd99cbf39d5965d7e59e362aea330fcfe014a
+5.6.17: git://github.com/docker-library/docker-mysql@a63bd99cbf39d5965d7e59e362aea330fcfe014a