[WASM] Install libcxx for host target

Author: kateinoigakukun

utils/build-presets.ini

@@ -2598,12 +2598,14 @@ llbuild
 swiftpm
 indexstore-db
 sourcekit-lsp
+libcxx
 
 install-llvm
 install-swift
 install-llbuild
 install-swiftpm
 install-sourcekit-lsp
+install-libcxx
 
 [preset: webassembly-linux-host]