Add _CRT_SECURE_NO_WARNINGS for Visual Studio build of Lua

This avoid a flood of warnings with Microsoft Visual Studio compilers
for not using Microsoft specific *_s CRT replacement functions.

VS2012/lua_lib/lua_lib.vcxproj

@@ -84,7 +84,7 @@
       </PrecompiledHeader>
       <WarningLevel>TurnOffAllWarnings</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>LUA_COMPAT_ALL;THREADSAFE=1;SQLITE_ENABLE_FTS3;SQLITE_ENABLE_FTS3_PARENTHESIS;WIN32;_DEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LUA_COMPAT_ALL;THREADSAFE=1;SQLITE_ENABLE_FTS3;SQLITE_ENABLE_FTS3_PARENTHESIS;WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(ProjectDir)..\..\src\third_party\lua-5.2.4\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
@@ -114,7 +114,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>LUA_COMPAT_ALL;THREADSAFE=1;SQLITE_ENABLE_FTS3;SQLITE_ENABLE_FTS3_PARENTHESIS;WIN32;NDEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LUA_COMPAT_ALL;THREADSAFE=1;SQLITE_ENABLE_FTS3;SQLITE_ENABLE_FTS3_PARENTHESIS;WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(ProjectDir)..\..\src\third_party\lua-5.2.4\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
@@ -187,4 +187,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>