removed unused call to com_xgraph

visualc/vngspice.vcxproj

@@ -850,7 +850,6 @@
     <ClInclude Include="..\src\frontend\com_state.h" />
     <ClInclude Include="..\src\frontend\com_strcmp.h" />
     <ClInclude Include="..\src\frontend\com_unset.h" />
-    <ClInclude Include="..\src\frontend\com_xgraph.h" />
     <ClInclude Include="..\src\frontend\control.h" />
     <ClInclude Include="..\src\frontend\cpitf.h" />
     <ClInclude Include="..\src\frontend\define.h" />
@@ -1444,7 +1443,6 @@
     <ClCompile Include="..\src\frontend\com_strcmp.c" />
     <ClCompile Include="..\src\frontend\com_sysinfo.c" />
     <ClCompile Include="..\src\frontend\com_unset.c" />
-    <ClCompile Include="..\src\frontend\com_xgraph.c" />
     <ClCompile Include="..\src\frontend\control.c" />
     <ClCompile Include="..\src\frontend\cpitf.c" />
     <ClCompile Include="..\src\frontend\define.c" />