Package remove: disable file owner checks if euid==0.

All package files even not owned by root should be removed, so make sure
that those checks return success while being root.

This fixes package removal for polkit, that had /etc/polkit/rules.d
files owned by the polkitd user.

NEWS

@@ -1,5 +1,9 @@
 xbps-0.42 (???):
 
+ * If removing a package and euid==0 do not check for file owner, being root
+   means that all files can be removed properly. This fixes package removal
+   when some files were not owned by root, rather by a system account.
+
  * Fixed 65 issues found by Coverity scan. Defect density is now below 0.30
    per 1000 lines of code.
 

lib/package_remove.c

@@ -65,7 +65,7 @@ check_remove_pkg_files(struct xbps_handle *xhp,
 			 * enough to ensure the user has write permissions
 			 * on the directory.
 			 */
-			if (!lstat(path, &st) && euid == st.st_uid) {
+			if (euid == 0 || (!lstat(path, &st) && euid == st.st_uid)) {
 				/* success */
 				continue;
 			}