zsh-fzf-tab: fix Darwin build

Old patch for Darwin is no longer needed, since the current version
pulled in already includes it.

pkgs/shells/zsh/zsh-fzf-tab/darwin.patch

@@ -1,11 +0,0 @@
-diff --git a/modules/Src/aloxaf/fzftab.c b/modules/Src/aloxaf/fzftab.c
-index 60b6330..91975d8 100644
---- a/modules/Src/aloxaf/fzftab.c
-+++ b/modules/Src/aloxaf/fzftab.c
-@@ -1,6 +1,5 @@
- #include "fzftab.mdh"
- #include "fzftab.pro"
--#include <malloc.h>
- #include <stdarg.h>
- #include <stdlib.h>
- #include <sys/stat.h>

pkgs/shells/zsh/zsh-fzf-tab/default.nix

@@ -15,8 +15,6 @@ in stdenv.mkDerivation rec {
 
   buildInputs = [ ncurses ];
 
-  patches = lib.optionals stdenv.isDarwin [ ./darwin.patch ];
-
   postConfigure = ''
     pushd modules
     ./configure --disable-gdbm --without-tcsetpgrp