modules: Handle SDL2 library achitecture when building on windows.

Signed-off-by: Squareys <Squareys@googlemail.com>

modules/FindSDL2.cmake

@@ -43,14 +43,19 @@
 if(CORRADE_TARGET_EMSCRIPTEN)
     set(_SDL2_PATH_SUFFIXES SDL)
 else()
+    # Precompiled libraries for Windows are in x86/x64 subdirectories
+    if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+        set(_SDL_LIBRARY_PATH_SUFFIX lib/x64)
+    elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
+        set(_SDL_LIBRARY_PATH_SUFFIX lib/x86)
+    endif()
+
     find_library(SDL2_LIBRARY
         # Compiling SDL2 from scratch on OSX creates dead libSDL2.so symlink
         # which CMake somehow prefers before the SDL2-2.0.dylib file. Making
         # the dylib first so it is preferred.
         NAMES SDL2-2.0 SDL2
-
-        # Precompiled libraries for Windows are in x86/x64 subdirectories
-        PATH_SUFFIXES lib/x86 lib/x64)
+        PATH_SUFFIXES ${_SDL_LIBRARY_PATH_SUFFIX})
     set(SDL2_LIBRARY_NEEDED SDL2_LIBRARY)
     set(_SDL2_PATH_SUFFIXES SDL2)
 endif()