Resolve warnings about used enum values in switch blocks.

Source/cmLocalVisualStudio6Generator.cxx

@@ -710,6 +710,8 @@ void cmLocalVisualStudio6Generator::SetBuildType(BuildType b,
 
   switch(b)
     {
+    case WIN32_EXECUTABLE:
+      break;
     case STATIC_LIBRARY:
       this->DSPHeaderTemplate = root;
       this->DSPHeaderTemplate += "/staticLibHeader.dsptemplate";

Source/cmLocalVisualStudio7Generator.cxx

@@ -1003,6 +1003,8 @@ void cmLocalVisualStudio7Generator::OutputBuildTool(std::ostream& fout,
     }
   switch(target.GetType())
     {
+    case cmTarget::UNKNOWN_LIBRARY:
+      break;
     case cmTarget::OBJECT_LIBRARY:
       {
       std::string libpath = this->GetTargetDirectory(target);

Source/cmVisualStudio10TargetGenerator.cxx

@@ -404,6 +404,9 @@ void cmVisualStudio10TargetGenerator::WriteProjectConfigurationValues()
       case cmTarget::UTILITY:
         configType += "Utility";
         break;
+      case cmTarget::GLOBAL_TARGET:
+      case cmTarget::UNKNOWN_LIBRARY:
+        break;
       }
     configType += "</ConfigurationType>\n";
     this->WriteString(configType.c_str(), 2);