Keep /usr/sbin if found as obsolete, it's a symlink in void.

NEWS

@@ -1,5 +1,8 @@
 xbps-0.46 (???):
 
+ * /usr/sbin is now a symlink in void, don't consider it as obsolete and never
+   remove it even if it was detected as obsolete.
+
  * xbps-rindex(1): use `-s, --sign` to initialize the repository archive
    with the required metadata to allow signed packages. Added `-S, --sign-pkg`
    to sign a specific package archive. This allows to sign a specific package,

lib/package_find_obsoletes.c

@@ -80,6 +80,7 @@ xbps_find_pkg_obsoletes(struct xbps_handle *xhp,
 	const char *basesymlinks[] = {
 		"./bin",
 		"./sbin",
+		"./usr/sbin",
 		"./lib",
 		"./lib32",
 		"./lib64",

lib/package_remove.c

@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 2009-2014 Juan Romero Pardines.
+ * Copyright (c) 2009-2015 Juan Romero Pardines.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -106,6 +106,7 @@ remove_pkg_files(struct xbps_handle *xhp,
 	const char *basesymlinks[] = {
 		"/bin",
 		"/sbin",
+		"/usr/sbin",
 		"/lib",
 		"/lib32",
 		"/lib64",