ECDH: Add Everest Curve25519 to VS project files

This being the first 3rdparty-contribution, we may want to consider the
structure of the project file generation scripts. Perhaps add small,
constribution-specific scripts to each directory in 3rdparty instead of adding
all constraints to generate_visualc_files.pl?
diff --git a/visualc/VS2010/crypto_examples.vcxproj b/visualc/VS2010/crypto_examples.vcxproj
index 2fa23a7..9df713b 100644
--- a/visualc/VS2010/crypto_examples.vcxproj
+++ b/visualc/VS2010/crypto_examples.vcxproj
@@ -94,7 +94,7 @@
       <WarningLevel>Level3</WarningLevel>

       <Optimization>Disabled</Optimization>

       <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>

-      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>

+      <AdditionalIncludeDirectories>../../include;../../3rdparty/everest/include/;../../3rdparty/everest/include/everest;../../3rdparty/everest/include/everest/vs2010;../../3rdparty/everest/include/everest/kremlib</AdditionalIncludeDirectories>

     </ClCompile>

     <Link>

       <SubSystem>Console</SubSystem>

@@ -114,7 +114,7 @@
       <WarningLevel>Level3</WarningLevel>

       <Optimization>Disabled</Optimization>

       <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>

-      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>

+      <AdditionalIncludeDirectories>../../include;../../3rdparty/everest/include/;../../3rdparty/everest/include/everest;../../3rdparty/everest/include/everest/vs2010;../../3rdparty/everest/include/everest/kremlib</AdditionalIncludeDirectories>

     </ClCompile>

     <Link>

       <SubSystem>Console</SubSystem>

@@ -136,7 +136,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>

       <IntrinsicFunctions>true</IntrinsicFunctions>

       <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>

-      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>

+      <AdditionalIncludeDirectories>../../include;../../3rdparty/everest/include/;../../3rdparty/everest/include/everest;../../3rdparty/everest/include/everest/vs2010;../../3rdparty/everest/include/everest/kremlib</AdditionalIncludeDirectories>

     </ClCompile>

     <Link>

       <SubSystem>Console</SubSystem>

@@ -156,7 +156,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>

       <IntrinsicFunctions>true</IntrinsicFunctions>

       <PreprocessorDefinitions>WIN64;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>

-      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>

+      <AdditionalIncludeDirectories>../../include;../../3rdparty/everest/include/;../../3rdparty/everest/include/everest;../../3rdparty/everest/include/everest/vs2010;../../3rdparty/everest/include/everest/kremlib</AdditionalIncludeDirectories>

     </ClCompile>

     <Link>

       <SubSystem>Console</SubSystem>