Unifying around the <class>_ntop() style; changing ntop_*() and pton_* to *_ntop() and *_pton(). Also added portable versions of strerror() and strerror_r() while updating the errno.c file. Change-Id: I2a0f40963f293ef9387b0dbcb3426276d301a17c Signed-off-by: Pete Delaney <piet.delaney@imgtec.com> Signed-off-by: Chris Dearman <chris.dearman@imgtec.com> Signed-off-by: Paul Lind <paul.lind@imgtec.com>