Get rid of warnings in Windows direct write headers

modules/juce_graphics/juce_graphics.cpp

@@ -44,6 +44,12 @@
  #import <QuartzCore/QuartzCore.h>
 
 #elif JUCE_WINDOWS
+  // get rid of some warnings in Window's own headers
+ #ifdef JUCE_MSVC
+  #pragma warning (push)
+  #pragma warning (disable : 4458)
+ #endif
+
  #if JUCE_MINGW && JUCE_USE_DIRECTWRITE
   #warning "DirectWrite not currently implemented with mingw..."
   #undef JUCE_USE_DIRECTWRITE
@@ -62,6 +68,10 @@
   #include <malloc.h>
  #endif
 
+ #ifdef JUCE_MSVC
+  #pragma warning (pop)
+ #endif
+
 #elif JUCE_IOS
  #import <QuartzCore/QuartzCore.h>
  #import <CoreText/CoreText.h>