set forward port from root640 to gcc16 cmsdist branch

Author: smuzaffar

forward_ports_map.py

@@ -131,6 +131,7 @@
 GIT_REPO_FWPORTS["cmsdist"]["IB/CMSSW_17_0_X/master"].append("IB/CMSSW_17_0_X/cudart")
 GIT_REPO_FWPORTS["cmsdist"]["IB/CMSSW_17_0_X/master"].append("IB/CMSSW_17_0_X/g14")
 GIT_REPO_FWPORTS["cmsdist"]["IB/CMSSW_17_0_X/rootmaster"] = ["IB/CMSSW_17_0_X/rootmodule"]
+GIT_REPO_FWPORTS["cmsdist"]["IB/CMSSW_17_0_X/root640"] = ["IB/CMSSW_17_0_X/gcc16"]
 GIT_REPO_FWPORTS["cmsdist"]["IB/CMSSW_17_0_X/g4"] = ["IB/CMSSW_17_0_X/g4adept"]
 GIT_REPO_FWPORTS["cmsdist"]["IB/CMSSW_17_0_X/g14"] = ["IB/CMSSW_17_0_X/g15"]
 GIT_REPO_FWPORTS["cmsdist"]["IB/CMSSW_17_0_X/g15"] = ["IB/CMSSW_17_0_X/gcc16"]