Fixed version honoring EXPLICIT_VERSION when present

Previously to master refactoring EXPLICIT_VERSION was used for VERSION if present.
This was missed in the refactor and caused our new LTS 3.27.0 packages to have improper names including the sha as .x packages would.

Ticket: ENT-13663
Changelog: none

Author: craigcomstock

build-scripts/version

@@ -17,7 +17,8 @@
 
 # The CFVERSION file is generated by the determine-version.sh script in the core
 # repository. The script is executed when you run the autogen.sh.
-VERSION=$(cat "$BASEDIR"/core/CFVERSION)
+CORE_VERSION=$(cat "$BASEDIR"/core/CFVERSION)
+VERSION="${EXPLICIT_VERSION:-$CORE_VERSION}"
 echo "$(basename $0): Debug: Detected CFEngine version number $VERSION"
 
 # The RELEASE number is the actual release of the package. It starts as 1 and