WinRT: build fixes for ARM + Release on Win81 and WinPhone81

It looks like MSVC 2013 might have a compiler-bug when building a particular
FreeType file, if and when /O2 is enabled for ARM builds.  This change makes
MSVC 2013 use /O1 on that file, for relevant builds.

Many thanks to asdron for details on the bug, and the fix!

VisualC-WinRT/WinPhone81_VS2013/freetype-WinPhone81.vcxproj

@@ -27,7 +27,9 @@
     <ClInclude Include="..\..\external\freetype-2.4.12\include\ft2build.h" />
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\external\freetype-2.4.12\src\autofit\autofit.c" />
+    <ClCompile Include="..\..\external\freetype-2.4.12\src\autofit\autofit.c">
+      <Optimization Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">MinSpace</Optimization>
+    </ClCompile>
     <ClCompile Include="..\..\external\freetype-2.4.12\src\base\ftbase.c" />
     <ClCompile Include="..\..\external\freetype-2.4.12\src\base\ftbbox.c" />
     <ClCompile Include="..\..\external\freetype-2.4.12\src\base\ftbitmap.c" />

VisualC-WinRT/WinRT81_VS2013/freetype-WinRT81.vcxproj

@@ -35,7 +35,9 @@
     <ClInclude Include="..\..\external\freetype-2.4.12\include\ft2build.h" />
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\external\freetype-2.4.12\src\autofit\autofit.c" />
+    <ClCompile Include="..\..\external\freetype-2.4.12\src\autofit\autofit.c">
+      <Optimization Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">MinSpace</Optimization>
+    </ClCompile>
     <ClCompile Include="..\..\external\freetype-2.4.12\src\base\ftbase.c" />
     <ClCompile Include="..\..\external\freetype-2.4.12\src\base\ftbbox.c" />
     <ClCompile Include="..\..\external\freetype-2.4.12\src\base\ftbitmap.c" />