[Discuss-gnuradio] building volk in MinGW

[Kyle Zhou]

I try to build volk in MinGW and find the following issues:
1) config.sub and config.guess are corrupt. They seems to be corrupted 
symlinks. This can be corrected by copying from top level directory.
2) The following files lead to compile error with undeclared clock_t etc.
   qa_32f_add_aligned16.cc
   qa_32f_divide_aligned16.cc
   qa_32f_multiply_aligned16.cc
   qa_32f_sqrt_aligned16.cc
   qa_16sc_magnitude_32f_aligned16.cc
This can be fixed by #include <ctime>

After these changes, make succeeded.
make check does nothing, so I have not checked the functionality.
I think I will study the usage of the volk library later.

Kyle