Port yuzu-emu/yuzu#9300: "CMake: Use precompiled headers to improve compile times" (#6213)

Co-authored-by: Ameer J <52414509+ameerj@users.noreply.github.com>

src/web_service/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_library(web_service STATIC
     announce_room_json.cpp
     announce_room_json.h
+    precompiled_headers.h
     telemetry_json.cpp
     telemetry_json.h
     verify_login.cpp
@@ -22,3 +23,7 @@ if (ANDROID)
 elseif(WIN32)
     target_link_libraries(web_service PRIVATE crypt32)
 endif()
+
+if (CITRA_USE_PRECOMPILED_HEADERS)
+    target_precompile_headers(web_service PRIVATE precompiled_headers.h)
+endif()

src/web_service/precompiled_headers.h

@@ -0,0 +1,7 @@
+// Copyright 2022 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_precompiled_headers.h"