Set universal CMP0167 cmake policy to fix nix build break.

[guylamar2006]

No description provided.

[ilya-fedin]

Can you explain why is this needed?

[ilya-fedin]

also, policies are applied here
https://github.com/kotatogram/kotatogram-desktop/blob/dev/CMakeLists.txt#L13

[ilya-fedin]

But looking at its description I'm not sure there's any sense to set it when you can just add CONFIG argument to find_package?

[ilya-fedin]

Or maybe even do like OpenAL (try both module and config)

cmake_helpers/external/openal/CMakeLists.txt

Lines 11 to 20 in b5d7cc3

	find_package(OpenAL)
	if (OPENAL_FOUND)
	target_include_directories(external_openal SYSTEM INTERFACE ${OPENAL_INCLUDE_DIR})
	target_link_libraries(external_openal INTERFACE ${OPENAL_LIBRARY})
	return()
	endif()
	find_package(OpenAL REQUIRED CONFIG)
	target_link_libraries(external_openal INTERFACE OpenAL::OpenAL)
	return()