bug#62779: avr-gcc fails after upgrade to gcc 10

[Kristian Lein-Mathisen <kristianlein@gmail.com>]

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Hi,

I'm no longer able to compile for attiny85:

klm@pal /tmp ➤ echo '' > test.c
klm@pal /tmp ➤ avr-gcc -mmcu=attiny85 test.c
avr-ld: cannot find crtattiny85.o: No such file or directory
avr-ld: cannot find -lm
avr-ld: cannot find -lc
avr-ld: cannot find -lattiny85
collect2: error: ld returned 1 exit status

I'm currently getting no output for avr-toolchain, which I believe is
related:

> ls -l $(guix build avr-toolchain)
total 0

I've been reading https://issues.guix.gnu.org/39918 and I think it may be
causing the problem. It seems that resulted in commit
197c1676d3733f6d8ce30bdc9977ba731b33ec71 (avr-libc going from function to
package) which seems to revert part of what's been done
in 4d2470b0efb399ad974e2a764db685e952b94323 (avr-libc going from package to
function).

I'm hoping would be kind enough to look into this.
Thank you,
Kris

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