Guile 2.2 .go files are larger

[Ludovic Courtès]

Hello!

The closure of Guix built with 2.0 is 193.8 MiB; when built with 2.2,
it’s 311.8 MiB.  Guix itself goes from 66 to 150 MiB:

--8<---------------cut here---------------start------------->8---
$ du -ms 
/gnu/store/jh07pwbyf5dbpdd5q0nvgagqkgmh76nh-guix-0.12.0-9.25a4/lib/guile/2.2
101     
/gnu/store/jh07pwbyf5dbpdd5q0nvgagqkgmh76nh-guix-0.12.0-9.25a4/lib/guile/2.2
$ du -ms 
/gnu/store/rnpz1svz4aw75kibb5qb02hhccy2m4y0-guix-0.12.0-7.aabe/lib/guile/2.0
24      
/gnu/store/rnpz1svz4aw75kibb5qb02hhccy2m4y0-guix-0.12.0-7.aabe/lib/guile/2.0
--8<---------------cut here---------------end--------------->8---

Would you have any suggestions to shrink the ELF files a bit?

Binutils’ ‘strip’ command bails out on .go files:

  strip: Unable to recognise the format of the input file 
`/gnu/store/jh07pwbyf5dbpdd5q0nvgagqkgmh76nh-guix-0.12.0-9.25a4/lib/guile/2.2/site-ccache/guix/scripts/refresh.go'

Also we’d rather avoid stripping debug info, if possible, to preserve
debuggability.

Thoughts?

Ludo’.