[Buildroot] --includedir=/usr/include vs --includedir=$(STAGING_DIR)/usr/include

[Steven J. Hill]

> Noticed that some .mk files use different --includedir= configure options.
> Shouldn't --includedir=/usr/include be used everywhere?
> 
With the recent changes that buildroot has undergone, I actually think
this is a good idea. Any objections to getting rid of 'include' in the
staging directory all together and going to 'usr/include'?

-Steve