build: Disable msvc warning 4722 for leveldb build

This prevents AppVeyor from failing on a warning in leveldb's new
Windows environment.

build_msvc/libleveldb/libleveldb.vcxproj

@@ -49,11 +49,11 @@
     <ClCompile Include="..\..\src\leveldb\util\status.cc" />
   </ItemGroup>
   <ItemDefinitionGroup>
-    <ClCompile>
-	 <PreprocessorDefinitions>HAVE_CRC32C=0;HAVE_SNAPPY=0;__STDC_LIMIT_MACROS;LEVELDB_IS_BIG_ENDIAN=0;_UNICODE;UNICODE;_CRT_NONSTDC_NO_DEPRECATE;LEVELDB_PLATFORM_WINDOWS;LEVELDB_ATOMIC_PRESENT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-	 <DisableSpecificWarnings>4244;4267;4312;</DisableSpecificWarnings>
-	 <AdditionalIncludeDirectories>..\..\src\leveldb;..\..\src\leveldb\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-	</ClCompile>
+     <ClCompile>
+       <PreprocessorDefinitions>HAVE_CRC32C=0;HAVE_SNAPPY=0;__STDC_LIMIT_MACROS;LEVELDB_IS_BIG_ENDIAN=0;_UNICODE;UNICODE;_CRT_NONSTDC_NO_DEPRECATE;LEVELDB_PLATFORM_WINDOWS;LEVELDB_ATOMIC_PRESENT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+       <DisableSpecificWarnings>4244;4267;4312;4722;</DisableSpecificWarnings>
+       <AdditionalIncludeDirectories>..\..\src\leveldb;..\..\src\leveldb\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+     </ClCompile>
   </ItemDefinitionGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />