lua: add build option for Lua support

The added build option USE_LUA (enabled by default) allows to enable/disable Lua
support in the build. This provides more control over the used dependencies, and
is important especially for OpenBSD and FreeBSD i386 builds, where the build
fails with enabled Lua support, see also [1].

[1] vinniefalco/LuaBridge#302

CMakeLists.txt

@@ -71,6 +71,7 @@ option(USE_LIBAO "Build with AO support" ON)
 option(USE_OSS "Build with OSS support" OFF)
 option(USE_PULSEAUDIO "Build with PulseAudio support" ON)
 option(USE_BREAKPAD "Build and link with breakpad library" ON)
+option(USE_LUA "Build with Lua support" ON)
 option(ENABLE_GDB_SERVER "Build with GDB debugging support" OFF)
 option(ENABLE_DC_PROFILER "Build with support for target machine (SH4) profiler" OFF)
 option(ENABLE_FC_PROFILER "Build with support for host app (Flycast) profiler" OFF)
@@ -473,12 +474,14 @@ if(NOT LIBRETRO)
 		target_link_libraries(${PROJECT_NAME} PRIVATE ZLIB::ZLIB)
 	endif()
 
-	find_package(Lua 5.2)
-	if(NOT APPLE AND LUA_FOUND)
-		target_compile_definitions(${PROJECT_NAME} PRIVATE USE_LUA)
-		target_include_directories(${PROJECT_NAME} PRIVATE ${LUA_INCLUDE_DIR} core/deps/luabridge/Source)
-		list(TRANSFORM LUA_LIBRARIES REPLACE "\.dll" "")
-		target_link_libraries(${PROJECT_NAME} PRIVATE ${LUA_LIBRARIES})
+	if(USE_LUA)
+		find_package(Lua 5.2)
+		if(NOT APPLE AND LUA_FOUND)
+			target_compile_definitions(${PROJECT_NAME} PRIVATE USE_LUA)
+			target_include_directories(${PROJECT_NAME} PRIVATE ${LUA_INCLUDE_DIR} core/deps/luabridge/Source)
+			list(TRANSFORM LUA_LIBRARIES REPLACE "\.dll" "")
+			target_link_libraries(${PROJECT_NAME} PRIVATE ${LUA_LIBRARIES})
+		endif()
 	endif()
 endif()