Merge topic 'drop-ancient-workarounds'

0f7bdd61 Remove VS 6 special case.
5e92c826 Remove some obsolete stuff.
15e42bb2 cmStandardIncludes: Remove obsolete cmOStringStream.
931e055d Port all cmOStringStream to std::ostringstream.
f194a009 Remove unused cmIStringStream class.
3ec1bb15 cmStandardIncludes: Remove std namespace hack.
bb3bce70 cmStandardIncludes: Remove ANSI_FOR_SCOPE hack.
28fa4923 cmStandardIncludes: Remove iostreams workaround for obsolete Compaq compiler.
837a8a63 cmStandardIncludes: Drop Comeau-related workaround.
4030ddfd Remove Borland-related undef.
17d6a6fd cmStandardIncludes: Remove comment about Borland.
26fb5011 Drop SGI as a CMake host compiler.

Source/cmGeneratorTarget.cxx

@@ -31,7 +31,7 @@ void reportBadObjLib(std::vector<cmSourceFile*> const& badObjLib,
 {
   if(!badObjLib.empty())
     {
-    cmOStringStream e;
+    std::ostringstream e;
     e << "OBJECT library \"" << target->GetName() << "\" contains:\n";
     for(std::vector<cmSourceFile*>::const_iterator i = badObjLib.begin();
         i != badObjLib.end(); ++i)
@@ -626,7 +626,7 @@ cmTargetTraceDependencies
                           this->GlobalGenerator->GetFilenameTargetDepends(sf);
         if (tgts.find(this->Target) != tgts.end())
           {
-          cmOStringStream e;
+          std::ostringstream e;
           e << "Evaluation output file\n  \"" << sf->GetFullPath()
             << "\"\ndepends on the sources of a target it is used in.  This "
               "is a dependency loop and is not allowed.";