CMakeLists: Add framebuffer_layout.cpp.

src/core/CMakeLists.txt

@@ -10,6 +10,7 @@ set(SRCS
             file_sys/savedata_archive.cpp
             file_sys/title_metadata.cpp
             frontend/emu_window.cpp
+            frontend/framebuffer_layout.cpp
             gdbstub/gdbstub.cpp
             hle/config_mem.cpp
             hle/kernel/address_arbiter.cpp