libgcrypt: fix pkgsStatic build on darwin

pkgs/by-name/li/libgcrypt/package.nix

@@ -95,7 +95,7 @@ stdenv.mkDerivation rec {
 
   # TODO: figure out why this is even necessary and why the missing dylib only crashes
   # random instead of every test
-  preCheck = lib.optionalString stdenv.hostPlatform.isDarwin ''
+  preCheck = lib.optionalString (stdenv.hostPlatform.isDarwin && !stdenv.hostPlatform.isStatic) ''
     mkdir -p $lib/lib
     cp src/.libs/libgcrypt.20.dylib $lib/lib
   '';