removed preprocessor defines from base.props... these were not used

vsprops/base.props

@@ -13,7 +13,8 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <AdditionalIncludeDirectories>$(SolutionDir)src\common\src;$(SolutionDir)src\core\src;$(SolutionDir)src\citrus\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES=1;_CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1</PreprocessorDefinitions>
+      <PreprocessorDefinitions>
+      </PreprocessorDefinitions>
       <RuntimeTypeInfo>false</RuntimeTypeInfo>
     </ClCompile>
     <Link>