h4cflib

HFRCFLIB-125, provide a workaround for a compiler issue at MacOS.

when calling the HDF-EOS2 SWinqswath function call. But find a workaround to handle this.
HDF-EOS function calls GDinqgrid and SWinqswath expect to receive the HDF-EOS2 file names that can be with a path. 
When the file name includes the absolute path before the file name like /Users/myang6/hdf-eosfile,
SWinqswath will return the number of swath as 0 even the file includes swath objects.
This will cause the added HDF4 objects not to be converted to the CF. 
The original code are 
const char *filename = file->get_file_name().c_str(); 
num_swaths = SWinqswath(const_cast<char*>(filename), NULL, (int32*)&len);


Now change to 
 std::string filename = file->get_file_name();
 num_swaths = SWinqswath(const_cast<char*>(filename.c_str()), NULL, (int32*)&len);