Fixed up a few filters and made it clear that the type change for the user_data_key::key_type was a workaround for a known bug in Clang 3.3.

Author: mikebmcl

N3888_RefImpl/src/N3888_RefImpl.vcxproj.filters

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <Filter Include="Source Files">
@@ -164,16 +164,16 @@
     <None Include="win32\DLLs\x86\Debug\cairo.pdb">
       <Filter>DLLs</Filter>
     </None>
-    <None Include="DLLs\x86\Debug\zlib1.dll">
+    <None Include="win32\DLLs\x86\Release\cairo.dll">
       <Filter>DLLs</Filter>
     </None>
-    <None Include="DLLs\x86\Debug\zlib1.pdb">
+    <None Include="win32\DLLs\x86\Debug\zlib1.dll">
       <Filter>DLLs</Filter>
     </None>
-    <None Include="DLLs\x86\Release\cairo.dll">
+    <None Include="win32\DLLs\x86\Release\zlib1.dll">
       <Filter>DLLs</Filter>
     </None>
-    <None Include="DLLs\x86\Release\zlib1.dll">
+    <None Include="win32\DLLs\x86\Debug\zlib1.pdb">
       <Filter>DLLs</Filter>
     </None>
   </ItemGroup>

N3888_RefImpl/src/drawing.h

@@ -354,7 +354,11 @@ namespace std {
 
 			class user_data_key {
 			public:
+#ifdef __clang__ // Workaround for Clang 3.3 not supporting 64-bit atomics on 32-bit GNU/Linux
 				typedef ::std::int_fast32_t key_type;
+#else
+				typedef ::std::int_fast64_t key_type;
+#endif
 			private:
 				static ::std::atomic<key_type> _Cnt;
 				key_type _Val;