exports, context: List unexported paths one per line in sorted order

This will reduce conflicts when new entries are added.

Helps: https://github.com/flatpak/flatpak/issues/5205
Signed-off-by: Simon McVittie <smcv@collabora.com>
(cherry picked from commit cee595763d)

common/flatpak-context.c

@@ -2435,8 +2435,26 @@ flatpak_context_make_sandboxed (FlatpakContext *context)
 }
 
 const char *dont_mount_in_root[] = {
-  ".", "..", "lib", "lib32", "lib64", "bin", "sbin", "usr", "boot", "efi",
-  "root", "tmp", "etc", "app", "run", "proc", "sys", "dev", "var", NULL
+  ".",
+  "..",
+  "app",
+  "bin",
+  "boot",
+  "dev",
+  "efi",
+  "etc",
+  "lib",
+  "lib32",
+  "lib64",
+  "proc",
+  "root",
+  "run",
+  "sbin",
+  "sys",
+  "tmp",
+  "usr",
+  "var",
+  NULL
 };
 
 static void

common/flatpak-exports.c

@@ -52,7 +52,12 @@
    flatpak_abs_usrmerged_dirs get the same treatment without having to be listed
    here. */
 const char *dont_export_in[] = {
-  "/usr", "/etc", "/app", "/dev", "/proc", NULL
+  "/app",
+  "/dev",
+  "/etc",
+  "/proc",
+  "/usr",
+  NULL
 };
 
 static char *