* 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
2e695fa03f