bug#51093: protobuf: 'disable-broken-tests' phasebuilder failed

[Christopher Howard <christopher@librehacker.com>]

When I try to install pokerth, dependency protobuf is forced to build
from source, and the build fails:

```
building /gnu/store/pg3wcla964wmnxfsmjngmq23jhp2p4kj-protobuf-
2.6.1.drv...
- 'disable-broken-tests' phasebuilder for
`/gnu/store/pg3wcla964wmnxfsmjngmq23jhp2p4kj-protobuf-2.6.1.drv' failed
with exit code 1
```

From the log:

```
phase `unpack' succeeded after 1.1 seconds
starting phase `disable-broken-tests'
Backtrace:
           9 (primitive-load "/gnu/store/mq3dlbl1x4zx64x4szlbqpdjp05…")
In ice-9/eval.scm:
   191:35  8 (_ #f)
In guix/build/gnu-build-system.scm:
    838:2  7 (gnu-build #:source _ #:outputs _ #:inputs _ #:phases . #)
In ice-9/boot-9.scm:
  1736:10  6 (with-exception-handler _ _ #:unwind? _ # _)
In srfi/srfi-1.scm:
   857:16  5 (every1 #<procedure 7ffff67770a0 at guix/build/gnu-bui…> …)
In guix/build/gnu-build-system.scm:
   847:30  4 (_ _)
In ice-9/eval.scm:
    619:8  3 (_ #(#(#<directory (guile-user) 7ffff63b8f00>) (# # …)))
In guix/build/utils.scm:
   736:30  2 (with-atomic-file-replacement "src/google/protobuf/any…" …)
In unknown file:
           1 (stat "src/google/protobuf/any_test.cc" #<undefined>)
In ice-9/boot-9.scm:
  1669:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1669:16: In procedure raise-exception:
In procedure stat: No such file or directory:
"src/google/protobuf/any_test.cc"
```

My system info:

```
christopher@nightshade ~$ neofetch --stdout
christopher@nightshade 
---------------------- 
OS: Guix System 9aaf402a379b9ac9e4c3eee5b16f7496d7606e91 x86_64 
Host: GA-880GM-UD2H 
Kernel: 5.13.16-gnu1 
Uptime: 7 days, 1 hour, 2 mins 
Packages: 108 (guix-system), 105 (guix-user) 
Shell: bash 5.0.16 
Resolution: 1920x1200 
DE: GNOME 3.34.5 
Theme: Adwaita [GTK2/3] 
Icons: Adwaita [GTK2/3] 
Terminal: .gnome-terminal 
CPU: AMD Athlon II X3 455 (3) @ 3.300GHz 
GPU: NVIDIA GeForce 8400 GS Rev. 3 
Memory: 1591MiB / 7893MiB 
```

-- 
Christopher Howard
Gemini capsule: gemini://gem.librehacker.com
Web version: https://portal.mozz.us/gemini/gem.librehacker.com