According to https://repology.org/repository/nix_unstable/problems, we have a
lot of packages that have http links that redirect to https as their homepage.
This commit updates all these packages to use the https links as their
homepage.
The following script was used to make these updates:
```
curl https://repology.org/api/v1/repository/nix_unstable/problems \
| jq '.[] | .problem' -r \
| rg 'Homepage link "(.+)" is a permanent redirect to "(.+)" and should be updated' --replace 's@$1@$2@' \
| sort | uniq > script.sed
find -name '*.nix' | xargs -P4 -- sed -f script.sed -i
```
imgtrust is needed to run netboot.xyz scripts.
ping is useful for testing network settings.
Also add HTTP option for clarity (it's already being built).
gcc5 enables additional warnings, causing the build to fail with
-Werror. The build could be fixed by specifically disabling errors
for `discarded-array-qualifiers` and `logical-not-parentheses` warnings,
but simply passing -Wno-error is more future proof.
See https://hydra.nixos.org/build/33274006/nixlog/1/raw
The following parameters are now available:
* hardeningDisable
To disable specific hardening flags
* hardeningEnable
To enable specific hardening flags
Only the cc-wrapper supports this right now, but these may be reused by
other wrappers, builders or setup hooks.
cc-wrapper supports the following flags:
* fortify
* stackprotector
* pie (disabled by default)
* pic
* strictoverflow
* format
* relro
* bindnow
