Avoid using KWSys auto_ptr by adopting it ourselves

Replace use of cmsys::auto_ptr with a CM_AUTO_PTR macro that maps to
our own implementation adopted from the KWSys auto_ptr implementation.
Later we may be able to map CM_AUTO_PTR to std::auto_ptr on compilers
that do not warn about it.

Automate the client site conversions:

    git grep -l auto_ptr -- Source/ | grep -v Source/kwsys/ | xargs sed -i \
      's|cmsys::auto_ptr|CM_AUTO_PTR|;s|cmsys/auto_ptr.hxx|cm_auto_ptr.hxx|'

Source/cmInstalledFile.h

@@ -22,7 +22,7 @@
 class cmInstalledFile
 {
 public:
-  typedef cmsys::auto_ptr<cmCompiledGeneratorExpression>
+  typedef CM_AUTO_PTR<cmCompiledGeneratorExpression>
     CompiledGeneratorExpressionPtrType;
 
   typedef std::vector<cmCompiledGeneratorExpression*> ExpressionVectorType;