lang/ghc: Update arm bootstrap to 8.10.7

Update arm bootstrap to 8.10.7
Pass --host to the configure script otherwise ghc thinks we are crosscompiling (only affects armv6 and armv7)
Remove CONFIGURE_ENV, it is now handled in patch-aclocal.m4 (submitted upstream as https://gitlab.haskell.org/ghc/ghc/-/merge_requests/6599)

Approved by: arrowd
Differential Revision: https://reviews.freebsd.org/D32155