Added USE_RETRO_ACHIEVEMENTS compiler flag

Added a flag to VS and CMake for enabling RetroAchievements integration.

CMakeLists.txt

@@ -72,6 +72,7 @@ option(USE_DISCORD_PRESENCE "Enables Discord Rich Presence, show the current gam
 option(USE_MGBA "Enables GBA controllers emulation using libmgba" ON)
 option(ENABLE_AUTOUPDATE "Enables support for automatic updates" ON)
 option(STEAM "Creates a build for Steam" OFF)
+option(USE_RETRO_ACHIEVEMENTS "Enables integration with retroachievements.org" ON)
 
 # Maintainers: if you consider blanket disabling this for your users, please
 # consider the following points:
@@ -975,7 +976,9 @@ add_subdirectory(Externals/rangeset)
 
 add_subdirectory(Externals/FatFs)
 
-add_subdirectory(Externals/rcheevos)
+if (USE_RETRO_ACHIEVEMENTS)
+	add_subdirectory(Externals/rcheevos)
+endif()
 
 ########################################
 # Pre-build events: Define configuration variables and write SCM info header

Source/Core/Core/CMakeLists.txt

@@ -602,7 +602,6 @@ PUBLIC
   ${MBEDTLS_LIBRARIES}
   pugixml
   RangeSet::RangeSet
-	rcheevos
   sfml-network
   sfml-system
   videonull
@@ -748,3 +747,8 @@ if(MSVC)
   # Add precompiled header
   target_link_libraries(core PRIVATE use_pch)
 endif()
+
+if(USE_RETRO_ACHIEVEMENTS)
+  target_link_libraries(core PRIVATE rcheevos)
+  target_compile_definitions(core PRIVATE -DUSE_RETRO_ACHIEVEMENTS)
+endif()

Source/Core/DolphinQt/CMakeLists.txt

@@ -686,4 +686,9 @@ endif()
 
 if(USE_DISCORD_PRESENCE)
   target_compile_definitions(dolphin-emu PRIVATE -DUSE_DISCORD_PRESENCE)
-endif()
+endif()
+
+if(USE_RETRO_ACHIEVEMENTS)
+  target_link_libraries(dolphin-emu PRIVATE rcheevos)
+  target_compile_definitions(dolphin-emu PRIVATE -DUSE_RETRO_ACHIEVEMENTS)
+endif()

Source/VSProps/Base.Dolphin.props

@@ -45,6 +45,7 @@
       <PreprocessorDefinitions Condition="'$(AutoUpdate)'!='false'">AUTOUPDATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions>HAVE_SDL2;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Steam)'=='true'">STEAM;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>USE_RETRO_ACHIEVEMENTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
 
       <!-- Warnings one may want to ignore when using Level4.
       4201  nonstandard extension used : nameless struct/union