build-core's HEAD is going to diverge for 1.6.0, so "capture" build-core's
current state in a branch mainly for b1_4.
Note that b_release_1_4_6-patchless is not really a release branch and thus
tracks b1_4.
Also, v1_2_8 and v1_4_0 pre-existed this build system so which branch to
check out for them is actually quite moot. Let's just keep them tracking
b1_4.
# These releases did not get build tagged for them because they
# this build system didn't exist when they were tagged
v1_2_8|v1_4_0)
- buildtag="HEAD"
+ buildtag="b1_4"
;;
- b_release_1_4_6-patchless) buildtag="HEAD" ;;
+ b1_4*) buildtag="b1_4" ;;
+
+ b_release_1_4_6-patchless) buildtag="b1_4" ;;
v* | b_release*) buildtag=$lustretag ;;