[gtk+] Visual Studio builds: Use _USE_MATH_DEFINES

[Chun-wei Fan <fanchunwei src gnome org>]

commit 1fec39ef0b858a392b4dec4f3ff76a592cfd0de9
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Jan 6 21:12:19 2016 +0800

    Visual Studio builds: Use _USE_MATH_DEFINES
    
    ... to fix the build as some C99 math constant macros are being used, such
    as M_SQRT2.

 build/win32/vs10/gtk3-build-defines.props  |    2 +-
 build/win32/vs9/gtk3-build-defines.vsprops |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/build/win32/vs10/gtk3-build-defines.props b/build/win32/vs10/gtk3-build-defines.props
index 7d0b721..2f05f23 100644
--- a/build/win32/vs10/gtk3-build-defines.props
+++ b/build/win32/vs10/gtk3-build-defines.props
@@ -19,7 +19,7 @@
   <ItemDefinitionGroup>
     <ClCompile>
       
<AdditionalIncludeDirectories>..\..\..;$(GlibEtcInstallRoot)\lib\glib-2.0\include;$(GlibEtcInstallRoot)\include\glib-2.0;$(GlibEtcInstallRoot)\include;$(GlibEtcInstallRoot)\include\cairo;$(GlibEtcInstallRoot)\include\atk-1.0;$(GlibEtcInstallRoot)\include\pango-1.0;$(GlibEtcInstallRoot)\include\gdk-pixbuf-2.0;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      
<PreprocessorDefinitions>HAVE_CONFIG_H;G_DISABLE_SINGLE_INCLUDES;ATK_DISABLE_SINGLE_INCLUDES;GDK_PIXBUF_DISABLE_SINGLE_INCLUDES;GTK_DISABLE_SINGLE_INCLUDES;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      
<PreprocessorDefinitions>HAVE_CONFIG_H;G_DISABLE_SINGLE_INCLUDES;ATK_DISABLE_SINGLE_INCLUDES;GDK_PIXBUF_DISABLE_SINGLE_INCLUDES;GTK_DISABLE_SINGLE_INCLUDES;_USE_MATH_DEFINES;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ForcedIncludeFiles>msvc_recommended_pragmas.h;%(ForcedIncludeFiles)</ForcedIncludeFiles>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <AdditionalOptions>/d2Zi+ %(AdditionalOptions)</AdditionalOptions>
diff --git a/build/win32/vs9/gtk3-build-defines.vsprops b/build/win32/vs9/gtk3-build-defines.vsprops
index 68ed803..f472c7c 100644
--- a/build/win32/vs9/gtk3-build-defines.vsprops
+++ b/build/win32/vs9/gtk3-build-defines.vsprops
@@ -10,7 +10,7 @@
        <Tool
                Name="VCCLCompilerTool"
                
AdditionalIncludeDirectories="..\..\..;$(GlibEtcInstallRoot)\lib\glib-2.0\include;$(GlibEtcInstallRoot)\include\glib-2.0;$(GlibEtcInstallRoot)\include;$(GlibEtcInstallRoot)\include\cairo;$(GlibEtcInstallRoot)\include\atk-1.0;$(GlibEtcInstallRoot)\include\pango-1.0;$(GlibEtcInstallRoot)\include\gdk-pixbuf-2.0"
-               
PreprocessorDefinitions="HAVE_CONFIG_H;G_DISABLE_SINGLE_INCLUDES;ATK_DISABLE_SINGLE_INCLUDES;GDK_PIXBUF_DISABLE_SINGLE_INCLUDES;GTK_DISABLE_SINGLE_INCLUDES"
+               
PreprocessorDefinitions="HAVE_CONFIG_H;G_DISABLE_SINGLE_INCLUDES;ATK_DISABLE_SINGLE_INCLUDES;GDK_PIXBUF_DISABLE_SINGLE_INCLUDES;GTK_DISABLE_SINGLE_INCLUDES;_USE_MATH_DEFINES"
                ForcedIncludeFiles="msvc_recommended_pragmas.h"
                AdditionalOptions="/MP"
        />