pam: bind Linux-PAM locales from pam-specific folder (upstream patch)

Without the change `pam` packa looks up locales already registered via
`bindtextdomain()`:

- shadow: /nix/store/ymcln55n92xm25sk2pipqbcp5xghwc3j-shadow-4.13/share/locale/
- glibc: /nix/store/ibp4camsx1mlllwzh32yyqcq2r2xsy1a-glibc-2.37-8/share/locale

Note that there is no `pam` pne in the list.

The change adds extra lookup location:

- linux-pam: /nix/store/k1lvsb3vyw2ijk9naamnay5nwc4mibda-linux-pam-1.5.2/share/locale

Before the change:

    $ LANGUAGE=fi su
    Password:
    su: Authentication failure

After the change:

    $ LANGUAGE=fi ./result-su/bin/su
    Salasana:
    su: Tunnistautumisvirhe

pkgs/os-specific/linux/pam/default.nix

@@ -1,5 +1,8 @@
-{ lib, stdenv, buildPackages, fetchurl, flex, cracklib, db4, gettext, audit, libxcrypt
+{ lib, stdenv, buildPackages, fetchurl
+, fetchpatch
+, flex, cracklib, db4, gettext, audit, libxcrypt
 , nixosTests
+, autoreconfHook269, pkg-config-unwrapped
 }:
 
 stdenv.mkDerivation rec {
@@ -11,12 +14,24 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-5OxxMakdpEUSV0Jo9JPG2MoQXIcJFpG46bVspoXU+U0=";
   };
 
-  patches = [ ./suid-wrapper-path.patch ];
+  patches = [
+    ./suid-wrapper-path.patch
+    # Pull support for localization on non-default --prefix:
+    #   https://github.com/NixOS/nixpkgs/issues/249010
+    #   https://github.com/linux-pam/linux-pam/pull/604
+    (fetchpatch {
+      name = "bind-locales.patch";
+      url = "https://github.com/linux-pam/linux-pam/commit/77bd338125cde583ecdfb9fd69619bcd2baf15c2.patch";
+      hash = "sha256-tlc9RcLZpEH315NFD4sdN9yOco8qhC6+bszl4OHm+AI=";
+    })
+  ];
 
   outputs = [ "out" "doc" "man" /* "modules" */ ];
 
   depsBuildBuild = [ buildPackages.stdenv.cc ];
-  nativeBuildInputs = [ flex ]
+  # autoreconfHook269 is needed for `bind-locales.patch` above
+  # pkg-config-unwrapped is needed for `AC_CHECK_LIB` and `AC_SEARCH_LIBS`
+  nativeBuildInputs = [ flex autoreconfHook269 pkg-config-unwrapped ]
     ++ lib.optional stdenv.buildPlatform.isDarwin gettext;
 
   buildInputs = [ cracklib db4 libxcrypt ]