message: build: bump to rc2
  Tree-SHA512:
diff: @@ -4,7 +4,7 @@ define(_CLIENT_VERSION_MAJOR, 0)
  define(_CLIENT_VERSION_MINOR, 18)
  define(_CLIENT_VERSION_REVISION, 0)
  define(_CLIENT_VERSION_BUILD, 0)
  -define(_CLIENT_VERSION_RC, 1)
  +define(_CLIENT_VERSION_RC, 2)
  define(_CLIENT_VERSION_IS_RELEASE, true)
  define(_COPYRIGHT_YEAR, 2019)
  define(_COPYRIGHT_HOLDERS,[The %s developers])
  