When decoding a paletted PNG, require that a PLTE chunk is seen before the first IDAT chunk.
When decoding a paletted PNG, require that a PLTE chunk is seen before
the first IDAT chunk.

R=rsc
APPROVED=rsc
DELTA=7  (2 added, 0 deleted, 5 changed)
OCL=34583
CL=34585

h8liu/golang,nightlyone/golang,h8liu/golang,nightlyone/golang,bdwalton/debian-golang,bdwalton/debian-golang,bdwalton/debian-golang,tianon/debian-golang,apparentlymart/golang,bdwalton/debian-golang,tv42/old-go,nightlyone/golang,h8liu/golang,gnanderson/go,ssrl/go,h8liu/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,apparentlymart/golang,dsriram/golang,bdwalton/debian-golang,bdwalton/debian-golang,nightlyone/golang,h8liu/golang,dsriram/golang,tv42/old-go,nightlyone/golang,nightlyone/golang,tianon/debian-golang,ssrl/go,bdwalton/debian-golang,gnanderson/go,h8liu/golang,tianon/debian-golang,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,ssrl/go,gnanderson/go,h8liu/golang,apparentlymart/golang,apparentlymart/golang,tv42/old-go,tianon/debian-golang,ssrl/go,dsriram/golang,ssrl/go,dsriram/golang,tianon/debian-golang,tianon/debian-golang,tv42/old-go,tianon/debian-golang,tv42/old-go,gnanderson/go,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,dsriram/golang,tianon/debian-golang,gnanderson/go,tv42/old-go,gnanderson/go,ssrl/go,bdwalton/debian-golang,apparentlymart/golang,pombredanne/go-deleteme,nightlyone/golang,pombredanne/go-deleteme,dsriram/golang,dsriram/golang