gettext: 0.21 -> 0.21.1

Unfortunately, there’s no release announcement for this release. From
the [NEWS][1].

> Version 0.21.1 - October 2022
>
> * Runtime behaviour:
> - On AIX, locale names with a script or with an uppercase language are now
> supported.
> For example, sr_Cyrl_RS.UTF-8 is treated like sr_RS.UTF-8@cyrillic, and
> EN_US.UTF-8 is treated like en_US.UTF-8.
>
> * The base Unicode standard is now updated to 14.0.0.
>
> * Portability:
> - Building on macOS 11/arm64 is now supported.
> - Building on Linux/powerpc64le with glibc ≥ 2.35 is now supported.

The vendored gnulib was also updated, which indirectly fixes a build
failure with clang 16. The version in 0.20 fails to build because it
attempts to assign an incompatible function pointer that should have but
does not have `__attribute__((noreturn))`. On clang 16, this is an error
by default.

[1]: https://git.savannah.gnu.org/gitweb/?p=gettext.git;a=blob_plain;f=NEWS;hb=8b38ee827251cadbb90cb6cb576ae98702566288

pkgs/development/libraries/gettext/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "gettext";
-  version = "0.21";
+  version = "0.21.1";
 
   src = fetchurl {
     url = "mirror://gnu/gettext/${pname}-${version}.tar.gz";
-    sha256 = "04kbg1sx0ncfrsbr85ggjslqkzzb243fcw9nyh3rrv1a22ihszf7";
+    sha256 = "sha256-6MNlDh2M7odcTzVWQjgsHfgwWL1aEe6FVcDPJ21kbUU=";
   };
   patches = [
     ./absolute-paths.diff
···
   '' + lib.optionalString stdenv.hostPlatform.isCygwin ''
     sed -i -e "s/\(cldr_plurals_LDADD = \)/\\1..\/gnulib-lib\/libxml_rpl.la /" gettext-tools/src/Makefile.in
     sed -i -e "s/\(libgettextsrc_la_LDFLAGS = \)/\\1..\/gnulib-lib\/libxml_rpl.la /" gettext-tools/src/Makefile.in
-  '' +
-  # This change to gettext's vendored copy of gnulib is already
-  # merged upstream; we can drop this patch on the next version
-  # bump.  It must be applied twice because gettext vendors gnulib
-  # not once, but twice!
-  ''
-    patch -p2 -d gettext-tools/gnulib-lib/ < ${gnulib.passthru.longdouble-redirect-patch}
-    patch -p2 -d gettext-tools/libgrep/    < ${gnulib.passthru.longdouble-redirect-patch}
   '';
 
   strictDeps = true;