* cmake: introduce AddTestLib macro
* test: prepare lauxilarily libs for LuaJIT-tests
* test: separate LuaJIT helpers from ffi_util.inc
* test: enable <ffi_arith_ptr.lua> in LuaJIT-tests
* test: enable <ffi_bitfield.lua> in LuaJIT-tests
* test: enable <ffi_call.lua> in LuaJIT-tests
* test: enable <ffi_callback.lua> in LuaJIT-tests
* test: enable <ffi_const.lua> in LuaJIT-tests
* test: enable <ffi_convert.lua> in LuaJIT-tests
* test: enable <ffi_enum.lua> in LuaJIT-tests
* test: enable <ffi_gcstep_recursive.lua>
* test: enable <ffi_jit_arith.lua> in LuaJIT-tests
* test: enable <ffi_jit_call.lua> in LuaJIT-tests
* test: enable <ffi_jit_conv.lua> in LuaJIT-tests
* test: enable <ffi_lex_number.lua> in LuaJIT-tests
* test: enable <ffi_metatype.lua> in LuaJIT-tests
* test: enable <ffi_new.lua> in LuaJIT-tests
* test: enable <ffi_parse_array.lua> in LuaJIT-tests
* test: enable <ffi_parse_basic.lua> in LuaJIT-tests
* test: enable <ffi_parse_cdef.lua> in LuaJIT-tests
* test: enable <ffi_parse_struct.lua> LuaJIT test
* test: enable <ffi_tabov.lua> LuaJIT test
* test: enable <lightud.lua> LuaJIT test
* test: enable <api_call.lua> LuaJIT test
* test: enable <catch_wrap.lua> LuaJIT test
* test: enable <catch_cpp.lua> LuaJIT test
* test: introduce routine to build error message
* test: enable CLI-related lua-Harness tests back

Closes #7834
Part of #9398
Follows up #5541

NO_DOC=LuaJIT submodule bump
NO_TEST=LuaJIT submodule bump
NO_CHANGELOG=add new tests