[magnum] Patch SDL2 includes, msbuild compatibility

Concerning SDL2 includes and how do they work. It is seems what the common practice is to append 'SDL2' include path to the compiler options and then do plain #include "SDL.h". While it works in cmake based projects it won't pass in msbuild ones. This patch changes #include to 'global' style <SDL2/SDL.h> and solves the problem.

ports/magnum/001-sdl-includes.patch

@@ -0,0 +1,20 @@
+diff --git a/src/Magnum/Platform/Sdl2Application.h b/src/Magnum/Platform/Sdl2Application.h
+index 99c3174..311b2c1 100644
+--- a/src/Magnum/Platform/Sdl2Application.h
++++ b/src/Magnum/Platform/Sdl2Application.h
+@@ -42,11 +42,11 @@
+ #ifdef CORRADE_TARGET_WINDOWS /* Windows version of SDL2 redefines main(), we don't want that */
+ #define SDL_MAIN_HANDLED
+ #endif
+-#include <SDL.h>
+-#include <SDL_scancode.h>
++#include <SDL2/SDL.h>
++#include <SDL2/SDL_scancode.h>
+ 
+ #ifdef CORRADE_TARGET_WINDOWS_RT
+-#include <SDL_main.h> /* For SDL_WinRTRunApp */
++#include <SDL2/SDL_main.h> /* For SDL_WinRTRunApp */
+ #include <wrl.h> /* For the WinMain entrypoint */
+ #endif
+ 
+

ports/magnum/CONTROL

@@ -1,4 +1,4 @@
 Source: magnum
-Version: jun2017-1
+Version: jun2017-2
 Build-Depends: corrade, sdl2, openal-soft
 Description: C++11/C++14 and OpenGL graphics engine http://mosra.cz/blog/magnum.php

ports/magnum/portfile.cmake

@@ -7,6 +7,11 @@ vcpkg_from_github(
     HEAD_REF master
 )
 
+vcpkg_apply_patches(
+    SOURCE_PATH ${SOURCE_PATH}
+    PATCHES ${CMAKE_CURRENT_LIST_DIR}/001-sdl-includes.patch 
+)
+
 if(VCPKG_LIBRARY_LINKAGE STREQUAL static)
     set(BUILD_STATIC 1)
 else()