libx11: refactor, move to pkgs/by-name and rename from xorg.libX11

refactorial changes:
- move `CPP` into `env`
- remove `sed 's,^as_dummy.*,as_dummy="\$PATH",' -i configure` because
  it didn't change anything other than the store paths in the resulting
  derivation (using `diff --recursive` (and `xxd` to diff binary files
  that changed))
- remove `xorg.buildPackages.libc.static` from `depsBuildBuild` since
  `xorg.buildPackages` doesn't exist (thus
  `xorg.buildPackages.libc.static or null` evaluating to `null`).
  Fixing that to `libc.static` (and moving it to `nativeBuildInputs`
  (where non-compiler deps belong)) actually broke the static build in
  a weird way i don't understand.

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