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/dedicated_room/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR}/CMakeModules)
 
 add_executable(citra-room
+    precompiled_headers.h
     citra-room.cpp
     citra-room.rc
 )
@@ -22,3 +23,7 @@ target_link_libraries(citra-room PRIVATE ${PLATFORM_LIBRARIES} Threads::Threads)
 if(UNIX AND NOT APPLE)
     install(TARGETS citra-room RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}/bin")
 endif()
+
+if (CITRA_USE_PRECOMPILED_HEADERS)
+    target_precompile_headers(citra-room PRIVATE precompiled_headers.h)
+endif()

src/dedicated_room/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"