Explicitly delete the copy constructor and copy assignment operator

The implicitly-declared copy constructor and copy assignment operator
of ProductParameterization are not deleted since the corresponding
functions of the member vector are defined, though ill-formed if they
are instantiated.

With dllexport, the compiler must generate all of the member functions
of the class, including those are implicitly-declared, so we need
explicitly delete the ill-formed ones.

Change-Id: Iaa763dfaefdc74a9840f244ba05c6bfd0bd99492

include/ceres/local_parameterization.h

diff --git a/include/ceres/local_parameterization.h b/include/ceres/local_parameterization.h
index 338ab54..a695638 100644
--- a/include/ceres/local_parameterization.h
+++ b/include/ceres/local_parameterization.h
@@ -280,6 +280,8 @@
 // rotation is represented using a quaternion.
 class CERES_EXPORT ProductParameterization : public LocalParameterization {
  public:
+  ProductParameterization(const ProductParameterization&) = delete;
+  ProductParameterization& operator=(const ProductParameterization&) = delete;
   //
   // NOTE: The constructor takes ownership of the input local
   // parameterizations.