build(wasm): libconstants can now compile to wasm and run as a wasm module

cross/macos_arm64.ini

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+[binaries]
+c = 'arm64-apple-darwin25-clang'
+cpp = 'arm64-apple-darwin25-clang++'
+ar = 'arm64-apple-darwin25-ar'
+strip = 'arm64-apple-darwin25-strip'
+pkg-config = 'pkg-config'
+ranlib = '/usr/bin/true'
+
+[host_machine]
+system = 'darwin'
+cpu_family = 'aarch64'
+cpu = 'arm64'
+endian = 'little'
+
+[built-in options]
+c_args = ['-mmacosx-version-min=15.0']
+cpp_args = ['-mmacos-version-min=15.0']
+c_link_args = ['-mmacosx-version-min=15.0']
+cpp_link_args = ['-mmacos-version-min=15.0']

cross/wasm.ini

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+[binaries]
+cpp = 'em++'
+ar = 'emar'
+strip = 'emstrip'
+
+exec_wrapper = 'node'
+
+[built-in options]
+cpp_args = ['-Dpkg_config=false', '-Dbuild_tests=false', '-Dbuild_examples=true', '-fwasm-exceptions', '-s', 'MEMORY64=1']
+cpp_link_args = ['-s', 'WASM=1', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'MEMORY64=1', '-fwasm-exceptions']
+
+[host_machine]
+system = 'emscripten'
+cpu_family = 'wasm64'
+cpu = 'wasm64'
+endian = 'little'
+
+[properties]
+cmake_toolchain_file = '/home/tboudreaux/Programming/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake'