Fix PCL compilation on Windows with MSVC 2015
MSVC 2015 does not fully support
constexpr declarations. However, since PCL 1.10.0, PCL uses them quite a lot to evaluate expressions
at compile-time and improve code readability.
As these expressions are not correctly resolved during compilation by MSVC 2015, a patch needs to be applied to remove these if compiling on Windows. This MR adds this patch.