[Rd] png device plot on athlon 64 processor (PR#7706)

[P.E.VerLorenvanThemaat at amc.uva.nl]

Full_Name: Emiel Ver Loren van Themaat
Version: 2.0.1
OS: windows XP
Submission from: (NULL) (145.117.31.248)


On our computers, which have windows xp sp2 installed and have a 64 bit
amd/athlon processor, the following simple code

png("test.png")
plot(1:10,main="hello")
dev.off()


results in a plot in which the "main" title is not visible at all. For 32-bit
computers with XP sp2 this bug does not occur. 

Hopefully this bug can be fixed.

(may be the png library is not up to date)