libkiwix 14.2.0 (new formula)

[adamlamar]

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libkiwix is a dependency of kiwix/kiwix-tools. Will be submitting kiwix-tools after this merges. In my local testing they work together correctly.

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• Is your test running fine brew test <formula>?
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• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes.

AI helped define the mustache dependency, the install steps, and test steps. kiwix-tools, a consumer of libkiwix, works correctly on my local system.

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[daeho-ro]

I hope there will be more functional test, not just printing version.

[daeho-ro]

It seems that the header will be used in other formula, too. So this should be a separated formula but the tag is outdated and cannot build without patch. For now, please leave a comment as follows:

Suggested change

	# Mustache header-only library (required dependency)
	# TODO: separate as a new formula once upstream release a new tag

[daeho-ro]

Suggested change

# Install Mustache header

[daeho-ro]

Suggested change

	# Get icu4c path for compilation
	icu4c = Formula["icu4c@78"]
	cxx_args = ["-std=c++17", "-I#{include}", "-I#{icu4c.opt_include}",
	"-L#{lib}", "-L#{icu4c.opt_lib}", "-lkiwix", "-o", "test"]
	if OS.mac?
	sdk_cxx_include = MacOS::CLT.sdk_path/"usr/include/c++/v1"
	cxx_args = ["-isystem#{sdk_cxx_include}"] + cxx_args if sdk_cxx_include.exist?
	end
	system ENV.cxx, "test.cpp", *cxx_args
	icu4c = Formula["icu4c@78"]
	system ENV.cxx, "test.cpp", "-std=c++17", "-o", "test", "-I#{include}", "-I#{icu4c.opt_include}",
	"-L#{lib}", "-L#{icu4c.opt_lib}", "-lkiwix"

[daeho-ro]

Suggested change

	# On macOS, CLT 17+ moved C++ stdlib headers into the SDK; pass them explicitly so
	# meson's atomics check can find <atomic> when configuring.
	# Also pass mustache include path via cpp_args so meson's has_header check finds it.
	extra_cxx_args = ["-I#{buildpath}/mustache"]
	if OS.mac?
	sdk_cxx_include = MacOS::CLT.sdk_path/"usr/include/c++/v1"
	extra_cxx_args << "-isystem#{sdk_cxx_include}" if sdk_cxx_include.exist?
	end
	system "meson", "setup", "build",
	"-Dcpp_args=#{extra_cxx_args.join(" ")}",
	*std_meson_args
	Is mustache build only? Since `buildpath` is a temporary path, this will not work at runtime.
	Anyway, this can be changed for now as follows:
	```suggestion
	ENV.append_to_cflags "-I#{buildpath}/mustache"
	system "meson", "setup", "build", *std_meson_args