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chore: append compat:libpng 1.6.59 #1649

Job	Run time
select	11s
lint	17s
graphics install: no side effects on unrelated members	4m 39s
workspace (linux llvm 2/4)	40s
workspace (linux llvm 3/4)	35s
workspace (linux llvm 0/4)	49s
workspace (windows default 0/1)	1m 27s
mirror-cn-reachable	7s
workspace (linux llvm 1/4)	51s
workspace (linux default 0/1)	47s
workspace (macos default 0/1)	57s
timings	5s
red members name their issues	6s
full sweep failed — open an issue	0s
	11m 31s