fix: Create $(PCD_ROOT)/include directory at compile time (#6)
fix: Create $(PCD_ROOT)/include directory at compile time (#6)

This change removes the dependency to have an empty directory as part of
the repo. In here, the necessary directory (i.e. include) is created as
part of the make condition.

Fixes #2: Remove empty directories from git
meetrp/pcd,meetrp/pcd,meetrp/pcd,meetrp/pcd