MSVC: add missing files to project (#3500)

Author: chrchr-github

lib/cppcheck.vcxproj

@@ -82,6 +82,7 @@
     <ClCompile Include="errorlogger.cpp" />
     <ClCompile Include="errortypes.cpp" />
     <ClCompile Include="exprengine.cpp" />
+    <ClCompile Include="infer.cpp" />
     <ClCompile Include="library.cpp" />
     <ClCompile Include="mathlib.cpp" />
     <ClCompile Include="path.cpp" />
@@ -144,6 +145,7 @@
     <ClInclude Include="ctu.h" />
     <ClInclude Include="errorlogger.h" />
     <ClInclude Include="errortypes.h" />
+    <ClInclude Include="infer.h" />	
     <ClInclude Include="library.h" />
     <ClInclude Include="mathlib.h" />
     <ClInclude Include="path.h" />