Build

[version] introduce `OT_THREAD_VERSION_1_4` #631

Job	Run time
pretty	39s
check (Debug, mDNSResponder)	22m 56s
check (Debug, avahi)	18m 58s
check (Release, mDNSResponder)	23m 2s
rest-check (rest-off)	22m 33s
check (Release, avahi)	18m 57s
rest-check	22m 50s
script-check	3m 38s
package	3m 42s
scan-build	1m 23s
simulation	6m 22s
	2h 25m 0s

Provide feedback