./autogen.sh and ./configure no longer need to be run prior to running
make for Contiki, LwIP or RIOT from the appropriate examples sub-directory.
scripts/fix_version.sh now handles updating coap.h for the different
LIBCOAP_ and PACKAGE_ definitions.
'make distclean' removes header files built from the .in files, which
means that they are not available for different OS builds.
The same is true for CMakeLists.txt.
Remove the need for the .in files and update for libcoap revisions
by using a new script scripts/fix_version.sh created from
scripts/fix_version.sh.in.
CI has been updated to check revisions have been updated in the
appropriate places.
Do not remove libcoap-3.sym and libcoap-3.map when doing 'make distclean'
as they are git tracked files.