build: Bump version for 0.19.1 final

Tree-SHA512: c0a5fbc072b03e36ffb9af23e699c6b3a897fcd509fdc3c6741ecc8e510aea5d87851c5a7926909746d03d390af10cae266189160b4a7b303f8be9418ea6a0c0

Author: laanwj

configure.ac

@@ -4,7 +4,7 @@ define(_CLIENT_VERSION_MAJOR, 0)
 define(_CLIENT_VERSION_MINOR, 19)
 define(_CLIENT_VERSION_REVISION, 1)
 define(_CLIENT_VERSION_BUILD, 0)
-define(_CLIENT_VERSION_RC, 2)
+define(_CLIENT_VERSION_RC, 0)
 define(_CLIENT_VERSION_IS_RELEASE, true)
 define(_COPYRIGHT_YEAR, 2019)
 define(_COPYRIGHT_HOLDERS,[The %s developers])