version: greatly simplify redo nonsense, now that we use VERSION.

Signed-off-by: David Anderson <danderson@tailscale.com>

version/ver.go.do

@@ -1,12 +1,9 @@
-redo-ifchange long.txt short.txt gitcommit.txt extragitcommit.txt ver.go.in
+redo-ifchange version-info.sh ver.go.in
 
-read -r LONGVER <long.txt
-read -r SHORTVER <short.txt
-read -r GITCOMMIT <gitcommit.txt
-read -r EXTRAGITCOMMIT <extragitcommit.txt
+. ./version-info.sh
 
-sed -e "s/{LONGVER}/$LONGVER/g" \
-    -e "s/{SHORTVER}/$SHORTVER/g" \
-    -e "s/{GITCOMMIT}/$GITCOMMIT/g" \
-    -e "s/{EXTRAGITCOMMIT}/$EXTRAGITCOMMIT/g" \
+sed -e "s/{LONGVER}/$VERSION_LONG/g" \
+    -e "s/{SHORTVER}/$VERSION_SHORT/g" \
+    -e "s/{GITCOMMIT}/$VERSION_GIT_HASH/g" \
+    -e "s/{EXTRAGITCOMMIT}/$VERSION_EXTRA_HASH/g" \
     <ver.go.in >$3