[BioC] affxparser: bug fix in Bioc 2.0

[Kasper Daniel Hansen]

affxparser has been updated to version 1.8.1 in Bioconductor 2.0.  
This bug fix fixes a compilation problem related to building  
universal binaries with R-2.5.0 on the Mac PPC platform.

Essentially the binary builds of affxparser should now work with the  
PPC platform. All other platforms should be unaffected as this error  
only pops up when you cross compile.

This bug is related to the thread cleanup/Makevars in R-devel.

Kasper