ispc: on ARM, build with ARM targets enabled, and updates (#38080)

* llvm: fix build with libcxx=none

* ispc: checksum 1.20.0

* ispc: ensure that it does not crash immediately

this would happen if linked to the wrong libc++

* ispc: fix build on macos

find ncurses instead of curses and link against tinfo in order to avoid
unresolved references to _del_curterm, _set_curterm, _setupterm, and
_tigetnum

* ispc: enable arm targets, if building on arm

* ispc: remove double cmake argument

I forgot to remove the constant -DARM_ENABLED=FALSE when adding
-DARM_ENABLED with a value depending on target architecture

* ispc: fix linux build

since 1.20, linux build uses TBB as default tasking system and thus
needs to depend on it

* ispc: try to fix link error on linux

link against both curses (as before) and tinfo (added because of macos)

* ispc: update for recent llvm changes

libcxx=none instead of ~libcxx

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