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chore: append compat:libpng 1.6.59 #68

Job	Run time
scan	22s
candidate (compat:libpng 1.6.59, macosx, default)	40s
candidate (compat:libpng 1.6.59, windows, default)	1m 28s
candidate (compat:libpng 1.6.59, linux, llvm)	34s
candidate (compat:libpng 1.6.59, linux, default)	43s
propose	0s
	3m 47s