cmigemo: pull upstream fixes for parallel build

Without the changes build fails on parallel build as:

    make[1]: Entering directory '/build/cmigemo'
    gcc -O2 -Wall  -fPIC -o build/object/charset.o -c src/charset.c
    Assembler messages:
    Fatal error: can't create build/object/charset.o: No such file or directory
    make[1]: *** [compile/unix.mak:33: build/object/charset.o] Error 1 shuffle=1655929862

pkgs/tools/text/cmigemo/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, fetchurl, buildPackages
+{ lib, stdenv, fetchFromGitHub, buildPackages
 , libiconv, nkf, perl, which
 , skk-dicts
 }:
@@ -13,8 +13,8 @@ stdenv.mkDerivation {
   src = fetchFromGitHub {
     owner = "koron";
     repo = "cmigemo";
-    rev = "5c014a885972c77e67d0d17d367d05017c5873f7";
-    sha256 = "0xrblwhaf70m0knkd5584iahaq84rlk0926bhdsrzmakpw77hils";
+    rev = "e0f6145f61e0b7058c3006f344e58571d9fdd83a";
+    sha256 = "00a6kdmxp16b8x0p04ws050y39qspd1bqlfq74bkirc55b77a2m1";
   };
 
   nativeBuildInputs = [ libiconv nkf perl which ];