fix SDL2 detection for Visual

externals/cmake-modules/FindSDL2.cmake

@@ -134,11 +134,17 @@ SET(SDL2_SEARCH_PATHS
     ${SDL2_PATH}
 )
 
+if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+    set(VC_LIB_PATH_SUFFIX lib/x64)
+else()
+    set(VC_LIB_PATH_SUFFIX lib/x86)
+endif()
+
 FIND_LIBRARY(SDL2_LIBRARY_TEMP
     NAMES SDL2
     HINTS
     $ENV{SDL2DIR}
-    PATH_SUFFIXES lib64 lib
+    PATH_SUFFIXES lib64 lib ${VC_LIB_PATH_SUFFIX}
     PATHS ${SDL2_SEARCH_PATHS}
 )