New comment by ndowens on void-packages repository

https://github.com/void-linux/void-packages/pull/27364#issuecomment-753173077

Comment:
> They fail because `errno` on Musl and Glibc expand differently by one space.
> 
> ```
> xml.sw:
> --- xml.sw.approved.txt
> 
> +++ xml.sw.unapproved.txt
> 
> -          errno == 1
> +          (*__errno_location()) == 1
>   
> ****************************
>   Results differed
> ```
> 
> Can you add this patch and remove your `|| msg_warn`
> 
> ```diff
> --- scripts/approvalTests.py	2019-12-28 21:24:04.000000000 +0100
> +++ -	2020-12-31 16:19:56.118506507 +0100
> @@ -44,7 +44,7 @@
>  
>  # errno macro expands into various names depending on platform, so we need to fix them up as well
>  errnoParser = re.compile(r'''
> -    \(\*__errno_location\ \(\)\)
> +    \(\*__errno_location\s*\(\)\)
>      |
>      \(\*__error\(\)\)
>      |
> ```
> 
> [catchorg/Catch2#2143](https://github.com/catchorg/Catch2/pull/2143)

Done