Add windowsXP cmake target

CMake/Platforms.cmake

@@ -31,6 +31,8 @@ elseif(TARGET_PLATFORM STREQUAL "miyoo_mini")
   include(platforms/miyoo_mini)
 elseif(TARGET_PLATFORM STREQUAL "windows9x")
   include(platforms/windows9x)
+elseif(TARGET_PLATFORM STREQUAL "windowsXP")
+  include(platforms/windowsXP)
 elseif(WIN32)
   include(platforms/windows)
 endif()

CMake/platforms/windowsXP.cmake

@@ -0,0 +1,29 @@
+set(ASAN OFF)
+set(UBSAN OFF)
+set(DIST ON)
+
+set(DISABLE_ZERO_TIER ON)
+set(DISCORD_INTEGRATION OFF)
+set(DEVILUTIONX_SYSTEM_BZIP2 OFF)
+set(DEVILUTIONX_STATIC_LIBSODIUM ON)
+
+list(APPEND DEVILUTIONX_PLATFORM_LINK_LIBRARIES
+  find_steam_game
+  shlwapi
+  wsock32
+  ws2_32
+  wininet
+)
+
+add_definitions(-DWINVER=0x0501 -D_WIN32_WINDOWS=0x0501 -D_WIN32_WINNT=0x0501)
+
+if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+  list(APPEND DEVILUTIONX_PLATFORM_COMPILE_OPTIONS "/W3" "/Zc:__cplusplus" "/utf-8")
+  list(APPEND DEVILUTIONX_PLATFORM_COMPILE_DEFINITIONS _CRT_SECURE_NO_WARNINGS)
+else()
+  list(APPEND DEVILUTIONX_PLATFORM_COMPILE_OPTIONS $<$<CONFIG:Debug>:-gstabs>)
+endif()
+
+if(MINGW_CROSS)
+  list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/mingw")
+endif()