Bug#1017663: ghc: Please upgrade to llvm-toolchain-14

[Ilias Tsitsimpis]

Control: retitle -1 Please upgrade to llvm-toolchain-14

I propose we keep this bug (which is also marked as Serious), to track
the migration to llvm-toolchain-14 (since llvm-toolchain-13 does no
longer build in unstable).

I tried using llvm-toolchain-16 with GHC 9.4.6-1~exp2 but it failed
(build logs at [1]). The plan is to use llvm-toolchain-14 in GHC 9.4.6.
Please open a new bug report to track the migration to llvm-toolchain-16.

[1] https://buildd.debian.org/status/fetch.php?pkg=ghc&arch=armel&ver=9.4.6-1%7Eexp2&stamp=1692531678&raw=0

Thanks,

-- 
Ilias