Test commit for building C UPM modules.
* Added C include directory
* Added C utilities directory
* Rename C++ upm.h -> upm.hpp to make room for C upm.h
* Added upm_mixed_module_init function to src/CMakeLists.txt. This
function takes filesnames similar to upm_module_init and does a
bit of processing before calling upm_module_init.
* Added c example directory. Changed c++ example names.
* Added dfrph implemention for testing (C++ wraps C). Added mraa
to .pc requires for dfrph. Tested against stand-alone project.
Added dfrph c example.
* Update implemention of pkg-config file generation.
* Added two cmake cache variables: BUILDCPP and BUILDFTI
* Removed src from swig_add_module calls, added libname to
swig_link_libraries calls. Shrinks swig'ed binaries by ~13%.
* Added install target in upm/CMakeLists.txt to install C header,
directory. Is this where we want this?
* C FTI header directory is include/fti
Signed-off-by: Noel Eck <noel.eck@intel.com>
