[setup] fix c++ compil error

[PierrickKoch]

fix #80

when calling python setup.py install --user
on Ubuntu 14.04 [gcc 4.8.4 / cython 0.20.1post0]:

pcl/_pcl.cpp: In function ‘int __pyx_pf_3pcl_4_pcl_10PointCloud___cinit__(__pyx_obj_3pcl_4_pcl_PointCloud*, PyObject*)’:
pcl/_pcl.cpp:3831:49: error: ‘>>’ should be ‘> >’ within a nested template argument list
   sp_assign<pcl::PointCloud<struct pcl::PointXYZ>>(__pyx_v_self->thisptr_shared, __pyx_t_1);
                                                 ^

[nzjrs]

Is this a Cython or gcc bug? What here is C++0x?

[PierrickKoch]

According to [1], since C++0x (aka. C++11) the '>>' (without space) is valid template list ending.
Before that it was somehow ambiguous with the Bitwise right shift operator[2].

[1] http://stackoverflow.com/questions/6695261/template-within-template-why-should-be-within-a-nested-template-arg
[2] http://en.cppreference.com/w/cpp/language/operator_arithmetic

[PierrickKoch]

as @larsmans mentioned in #59 it's probably a Cython bug that was fixed in 0.21
cython/cython@43d1490e , and I'm still using 0.20.1

[larsmans]

Isn't it easier to just upgrade Cython? Switching to C++11 mode is a sledgehammer that can break all kinds of stuff, and option syntax is different between compilers.

[nzjrs]

I agree with lars