[oe] Can a .bbappend introduce a different PACKAGE_ARCH ?

[Carlos Rafael Giani]

Hello,

assume there is package foo, which is normally not dependent on a 
specific machine. It is built with default, machine independent 
configuration options.
But then I want to add a .bbappend to it, which add some configuration 
options that make it machine dependent (imagine something like 
--device=beagleboard).
I then add PACKAGE_ARCH=${MACHINE_ARCH} to the .bbappend file. Is this 
actually okay to do? Or does it break something?