libblkid: Unexport the private symbol blkid_devdirs

blkid_devdirs was defined in blkidP.h and was never intended to be
used outside of the library.  Since it no longer needs to be shared
across object files, rename it and turn it into a static variable.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
3 files changed