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ARM64: Allow building with unwinding disabled.

(cherry-picked from commit 5677985dc)

Prior to this patch, the LuaJIT build with the
`-DLUAJIT_NO_UNWIND=1` option enabled failed on ARM64 because of
linker relocation error related to dwarf-specific code:
| /usr/bin/ld: lj_vm_dyn.o: relocation R_AARCH64_PREL32 against
| symbol `lj_err_unwind_dwarf' which may bind externally can not
| be used when making a shared object; recompile with -fPIC
| lj_vm_dyn.o:(.eh_frame+0x12): dangerous relocation: unsupported
| relocation

This patch disables emission of the `.eh_frame` section for
builds without unwinding to solve the issue.

The `LUAJIT_NO_UNWIND` build option is added to CMakeLists.txt.
This patch adds this build flavor to our exotic builds workflow.

Maxim Kokryashkin:
* added the description for the problem

Part of tarantool/tarantool#9145

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