Detecting binary package build

[Jason Bacon <bacon4000%gmail.com@localhost>]

Is there a canonical way to detect a binary package build within the 
package Makefile, whether the build was invoked by pbulk or just "make 
package"?

I just added wip/openblas and I want to use different build options for 
a binary package and a local source build.

I.e. if building a binary package for distribution on x86, I would 
enable DYNAMIC_ARCH, which generates CPU-agnostic code. When doing a 
local source build, I would turn this off so the upstream build system 
can optimize for the local CPU.

Thanks...

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