C++ Used In IGA Headers

[matthew-olson-intel]

When using kv.h within a C program, the following errors occur:

include/iga/iga_types_swsb.hpp:14:1: error: unknown type name 'namespace'
...
include/iga/kv.h:99:24: error: unknown type name 'kv_t'
...

These errors are due to kv.h including a C++ header file.