git: Adding -lgcc_s on darwin causes the build to fail, so we disable it for that platform

pkgs/applications/version-management/git-and-tools/git/default.nix

@@ -32,7 +32,7 @@ stdenv.mkDerivation {
     ++ stdenv.lib.optionals guiSupport [tcl tk];
 
   # required to support pthread_cancel()
-  NIX_LDFLAGS = "-lgcc_s";
+  NIX_LDFLAGS = stdenv.lib.optionalString (!stdenv.isDarwin) "-lgcc_s";
 
   makeFlags = "prefix=\${out} PERL_PATH=${perl}/bin/perl SHELL_PATH=${stdenv.shell} "
       + (if pythonSupport then "PYTHON_PATH=${python}/bin/python" else "NO_PYTHON=1");