Simplify runtime version code more
Simplify runtime version code more

It's no longer a build-time injected variable (as the comment above its
block indicates), so move it to the map below.

AlekSi/prometheus,alileza/prometheus,keegancsmith/prometheus,ton31337/prometheus,tattsun/prometheus,sudhi-vm/prometheus,ton31337/prometheus,AlekSi/prometheus,dsymonds/prometheus,dsymonds/prometheus,amorken/prometheus,Gouthamve/prometheus,Gouthamve/prometheus,Gouthamve/prometheus,prometheus/prometheus,adamron1/prometheus,slok/prometheus,slok/prometheus,alileza/prometheus,gottwald/prometheus,Gouthamve/prometheus,prometheus/prometheus,slok/prometheus,tomwilkie/prometheus,datajet-io/prometheus,SaltedMan/prometheus-annotated,amorken/prometheus,msiebuhr/prometheus,dsymonds/prometheus,datajet-io/prometheus,kangwoo/prometheus,datajet-io/prometheus,tomwilkie/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,JavierZunzunegui/prometheus,msiebuhr/prometheus,brancz/prometheus,Colstuwjx/prometheus,Stackdriver/stackdriver-prometheus,agaoglu/prometheus,GoogleCloudPlatform/prometheus,dmilstein/prometheus,amorken/prometheus,yanghongkjxy/prometheus,Conorbro/prometheus,ton31337/prometheus,prometheus/prometheus,ton31337/prometheus,tomwilkie/prometheus,adamron1/prometheus,agaoglu/prometheus,GoogleCloudPlatform/prometheus,dsymonds/prometheus,alileza/prometheus,Conorbro/prometheus,sudhi-vm/prometheus,brancz/prometheus,adamron1/prometheus,alileza/prometheus,SaltedMan/prometheus-annotated,kzittritsch/prometheus,dmilstein/prometheus,Colstuwjx/prometheus,Colstuwjx/prometheus,AlekSi/prometheus,prometheus/prometheus,Stackdriver/stackdriver-prometheus,yanghongkjxy/prometheus,JavierZunzunegui/prometheus,AlekSi/prometheus,agaoglu/prometheus,msiebuhr/prometheus,SaltedMan/prometheus-annotated,keegancsmith/prometheus,Conorbro/prometheus,gottwald/prometheus,dmilstein/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,kzittritsch/prometheus,GoogleCloudPlatform/prometheus,gottwald/prometheus,Stackdriver/stackdriver-prometheus,dmilstein/prometheus,PrFalken/prometheus,tattsun/prometheus,kzittritsch/prometheus,yanghongkjxy/prometheus,gottwald/prometheus,tattsun/prometheus,kangwoo/prometheus,tomwilkie/prometheus,JavierZunzunegui/prometheus,slok/prometheus,PrFalken/prometheus,kangwoo/prometheus,brancz/prometheus,brancz/prometheus,SaltedMan/prometheus-annotated,GoogleCloudPlatform/prometheus,datajet-io/prometheus,JavierZunzunegui/prometheus,Stackdriver/stackdriver-prometheus,sudhi-vm/prometheus,PrFalken/prometheus,keegancsmith/prometheus,Conorbro/prometheus,Colstuwjx/prometheus,sudhi-vm/prometheus,yanghongkjxy/prometheus,adamron1/prometheus,prometheus/prometheus,kangwoo/prometheus,msiebuhr/prometheus,agaoglu/prometheus,kzittritsch/prometheus,amorken/prometheus,PrFalken/prometheus,tattsun/prometheus