Mark code that escapes/unescapes "sudo -s cmd args..." for removal.

A future version of the plugin API will defer any such escaping
to the policy plugin so it can be configurable.

plugins/sudoers/strlcpy_unesc.c

@@ -29,6 +29,9 @@
 
 #include "sudoers.h"
 
+/*
+ * Like strlcpy() but collapses non-space chars escaped with a backslash.
+ */
 size_t
 strlcpy_unescape(char *dst, const char *src, size_t size)
 {