Build

[border-agent] config related OpenThread core build flag according to… #633

Job	Run time
check (Debug, mDNSResponder)	22m 57s
check (Debug, avahi)	18m 53s
check (Release, mDNSResponder)	22m 51s
check (Release, avahi)	19m 12s
package	3m 37s
pretty	49s
rest-check (rest-off)	22m 48s
rest-check	23m 3s
scan-build	1m 24s
script-check	3m 59s
simulation	6m 46s
	2h 26m 19s

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