Mention support of older go versions in packaging.

CHANGELOG.md

@@ -16,11 +16,13 @@
 
 ### Changed defaults / behaviours
 
-- Building Singularity requires go >=1.16. We now aim to support the
-  two most recent stable versions of Go. This corresponds to the Go
+- Building Singularity from source requires go >=1.16. We now aim to support
+  the two most recent stable versions of Go. This corresponds to the Go
   [Release Maintenance Policy](https://github.com/golang/go/wiki/Go-Release-Cycle#release-maintenance)
   and [Security Policy](https://golang.org/security), ensuring critical bug
   fixes and security patches are available for all supported language versions.
+  However, rpm and debian packaging apply patches to support older native go
+  installations.
 - LABELs from Docker/OCI images are now inherited. This fixes a longstanding
   regression from Singularity 2.x. Note that you will now need to use
   `--force` in a build to override a label that already exists in the source