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/core/CMakeLists.txt

@@ -449,6 +449,7 @@ add_library(core STATIC
     movie.h
     perf_stats.cpp
     perf_stats.h
+    precompiled_headers.h
     rpc/packet.cpp
     rpc/packet.h
     rpc/rpc_server.cpp
@@ -504,3 +505,7 @@ endif()
 if (ENABLE_FFMPEG_VIDEO_DUMPER)
     target_link_libraries(core PUBLIC FFmpeg::avcodec FFmpeg::avformat FFmpeg::swscale FFmpeg::swresample FFmpeg::avutil)
 endif()
+
+if (CITRA_USE_PRECOMPILED_HEADERS)
+    target_precompile_headers(core PRIVATE precompiled_headers.h)
+endif()