simplify constraint parsing in rcl_release
simplify constraint parsing in rcl_release

Signed-off-by: Jordan Wilberding <220780119b0515e812290c52572d947e9668976c@gmail.com>

bsmr-erlang/relx,syl20bnr/relx,priestjim/relx,ethercrow/relx,erlware/relx,tsloughter/relx,bitwalker/relx,RJ/relx,umatomba/relx,lrascao/relx,zugolosian/relx,Licenser/relx,ingwinlu/relx,timclassic/relx