New comment by the-maldridge on void-packages repository

https://github.com/void-linux/void-packages/pull/17969#issuecomment-570085138

Comment:
Bootstrap fails with:

```
=> gcc-9.2.0_3: the following build options are set:
   ada: Enable Ada build (ON)
   gnatboot: Enable Ada bootstrap using adacore.com binaries (OFF)
=> gcc-9.2.0_3: building (dependency of base-chroot) for x86_64...
   [check] dejagnu-1.6.2_1: not found
   [target] zlib-devel-1.2.11_3: found (/home/maldridge/Documents/void/packages/hostdir/binpkgs/chroot-v2)
   [runtime] binutils-2.33.1_1: found (/home/maldridge/Documents/void/packages/hostdir/binpkgs/chroot-v2)
   [runtime] libgcc-devel-9.2.0_3: not found (subpkg, ignored)
   [runtime] libstdc++-devel-9.2.0_3: not found (subpkg, ignored)
   [runtime] libssp-devel-9.2.0_3: not found (subpkg, ignored)
   [runtime] glibc-devel-2.30_1: found (/home/maldridge/Documents/void/packages/hostdir/binpkgs/chroot-v2)
=> ERROR: dejagnu is not a bootstrap package and cannot be built without it.
=> ERROR: Please install bootstrap packages and try again.
=> ERROR: xbps-src: failed to build host dependency 'dejagnu-1.6.2_1' (1)
=> ERROR: xbps-src: failed to build target dependency 'gcc-9.2.0_3' (1)
```

I can disable tests and this should clear, but bootstrap either should handle the tests correctly, or coerce them to off since the test executables may not be available at bootstrap time.