[Legacy] Sync legacy branch with stable #307

Job	Run time
generate_target_matrix	3s
build_firmware (ar71xx-generic)	2h 0m 9s
build_firmware (ar71xx-mikrotik)	1h 20m 45s
build_firmware (ar71xx-nand)	1h 41m 35s
build_firmware (ar71xx-tiny)	1h 1m 56s
build_firmware (ath79-generic)	1h 23m 45s
build_firmware (brcm2708-bcm2708)	1h 46m 2s
build_firmware (brcm2708-bcm2709)	1h 41m 5s
build_firmware (brcm2708-bcm2710)	1h 32m 26s
build_firmware (ipq40xx-generic)	1h 52m 46s
build_firmware (ipq806x-generic)	1h 49m 51s
build_firmware (lantiq-xrx200)	1h 43m 16s
build_firmware (lantiq-xway)	1h 42m 4s
build_firmware (mpc85xx-generic)	1h 19m 26s
build_firmware (mpc85xx-p1020)	1h 23m 45s
build_firmware (mvebu-cortexa9)	1h 21m 45s
build_firmware (ramips-mt7620)	1h 52m 52s
build_firmware (ramips-mt7621)	1h 44m 31s
build_firmware (ramips-mt76x8)	1h 42m 54s
build_firmware (ramips-rt305x)	52m 48s
build_firmware (sunxi-cortexa7)	1h 46m 4s
build_firmware (x86-64)	1h 32m 27s
build_firmware (x86-generic)	1h 34m 48s
build_firmware (x86-geode)	1h 56m 42s
build_firmware (x86-legacy)	1h 31m 3s
create_release	0s
	1d 14h 14m 48s

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