bug#45934: native-comp - Dylib ID of ELN files not optimal

[xgutter]

Ciao Andrea,

It took a bit long to find some time to test your patch, sorry for this. I 
slightly changed your patch adding `-dynamiclib` before `-install-name` 
otherwise I was getting an error.

```
SSDATA (concat2 (build_string ("-dynamiclib -install_name "),
```

Even with this change the Dylib ID of the ELN files is not changed. See below:


```
otool -D 
native-lisp/28.0.50-x86_64-apple-darwin19.6.0-a6e4783a5ef98abfce43023b5021c5a0/x-win-3c49581f605e9300257e9a0c4594695d-57571c2341c5223f94e6710bc3fe737f.eln
native-lisp/28.0.50-x86_64-apple-darwin19.6.0-a6e4783a5ef98abfce43023b5021c5a0/x-win-3c49581f605e9300257e9a0c4594695d-57571c2341c5223f94e6710bc3fe737f.eln:
/var/folders/77/680fcz1x5ydb0r8f93kj36b0wws01s/T//libgccjit-7kfo57/fake.so
```

Regards,
Davide


> On 30 Jan 2021, at 09:18, davide.restivo--- via Bug reports for GNU Emacs, 
> the Swiss army knife of text editors <bug-gnu-emacs@gnu.org> wrote:
> 
> Hi Andrea,
> 
> Thanks, I will make some tests and come back to you asap.
> 
> Regards,
> Davide
> 
> 
>> On 28 Jan 2021, at 22:59, akrl--- via Bug reports for GNU Emacs, the Swiss 
>> army knife of text editors <bug-gnu-emacs@gnu.org> wrote:
>> 
>> Ciao Davide,
>> 
>> could you give it a try with the following blind patch? (can't test it
>> my-self).
>> 
>> Thanks
> 
> 
> 
>