[unuran] download from LCG instead of bundle builtin and use CMake target

[ferdymercury]

Variant of #21938 but using LCG link

[github-actions]

Test Results

    22 files      22 suites   3d 9h 18m 49s ⏱️
 3 856 tests  3 856 ✅ 0 💤 0 ❌
76 166 runs  76 166 ✅ 0 💤 0 ❌

Results for commit 06e95a5.

♻️ This comment has been updated with latest results.

[ferdymercury]

gentle ping @lmoneta

[dpiparo]

thanks for these changes.
The only difference between unuran and other packages now not in source, e.g. lzma, is that it is not installable on linux and mac: indeed unuran is not present in Homebrew. This is not a blocker, but certainly something that introduces a symmetry, requiring always to have an internet connection on mac, because it is not possible to install locally all ROOT dependencies (unuran does not exist in brew)

[ferdymercury]

Yep, libunuran-dev exists on latest ubuntu and unuran-devel exists on alma, but not on homebrew for mac.
Do we know of someone with experience with homebrew that could be willing to give it a try to adding a formula for it so that we can restore symmetry? Maybe @henryiii ?

[ferdymercury]

mac: indeed unuran is not present in Homebrew.

I just proposed a new homebrew formula: Homebrew/homebrew-core#288800

[ferdymercury]

Formula merged! So unuran is now part of homebrew.

[ferdymercury]

@dpiparo @couet @linev could you install unuran via brew in the Mac14/15/26/beta runners?
That way we can turn the builtin to OFF in the CI. (Or at least on some of these macs).