relnotes: Add note about get-environment-variables fix.

diff --git a/src/relnotes/bug-getenv b/src/relnotes/bug-getenv
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index 0000000..467db5f
--- /dev/null
+++ b/src/relnotes/bug-getenv
@@ -0,0 +1,3 @@
+Bug fix: The `get-environment-variables' procedure was broken in a
+backport from master to the 11.x branch to avoid storing incidental
+parts of the process environment in band files.  The bug is now fixed.