libgpg-error: Add RISC-V patch.

pkgs/development/libraries/libgpg-error/default.nix

@@ -1,5 +1,5 @@
 { stdenv, buildPackages, fetchurl, gettext
-, genPosixLockObjOnly ? false
+, hostPlatform, genPosixLockObjOnly ? false
 }: let
   genPosixLockObjOnlyAttrs = stdenv.lib.optionalAttrs genPosixLockObjOnly {
     buildPhase = ''
@@ -24,6 +24,8 @@ in stdenv.mkDerivation (rec {
     sha256 = "1li95ni122fzinzlmxbln63nmgij63irxfvi52ws4zfbzv3am4sg";
   };
 
+  patches = if hostPlatform.isRiscV then ./riscv.patch else null;
+
   postPatch = ''
     sed '/BUILD_TIMESTAMP=/s/=.*/=1970-01-01T00:01+0000/' -i ./configure
   '' + stdenv.lib.optionalString stdenv.hostPlatform.isMusl ''