Drop transition for old debug package migration.

Changes-By: lintian-brush
Fixes: lintian: debug-symbol-migration-possibly-complete
See-also: https://lintian.debian.org/tags/debug-symbol-migration-possibly-complete.html

debian/changelog

@@ -2,6 +2,7 @@ cmake (3.18.4-3) UNRELEASED; urgency=medium
 
   * Trim trailing whitespace.
   * Fix day-of-week for changelog entries 1.2-1, 1.0-1, 1.2-1, 1.0-1.
+  * Drop transition for old debug package migration.
 
  -- Debian Janitor <janitor@jelmer.uk>  Fri, 03 Sep 2021 17:36:22 -0000
 

debian/rules

@@ -71,9 +71,6 @@ override_dh_installdocs-indep:
 override_dh_sphinxdoc:
 	dh_sphinxdoc -pcmake-doc
 
-override_dh_strip:
-	dh_strip --dbgsym-migration='cmake-dbg (<< 3.5.0-1~)'
-
 %:
 	dh $@ --with=sphinxdoc --builddirectory=Build