bump version to 50.12-r3rc1

Author: myk002

CMakeLists.txt

@@ -8,8 +8,8 @@ project(dfhack)
 
 # set up versioning.
 set(DF_VERSION "50.12")
-set(DFHACK_RELEASE "r2.1")
-set(DFHACK_PRERELEASE FALSE)
+set(DFHACK_RELEASE "r3rc1")
+set(DFHACK_PRERELEASE TRUE)
 
 set(DFHACK_VERSION "${DF_VERSION}-${DFHACK_RELEASE}")
 set(DFHACK_ABI_VERSION 2)