[yocto] Qt SDK Static Build

[Smith, Virgil]

> > $ bitbake meta-toolchain-qt5
>
> well SDKIMAGE_FEATURES only work when you generate SDKs using -
> cpopulate_sdk out of real images and not meta-toolchain-* targets which IMO
> should no longer be used.

As a (non-expert/non-maintainer) user, I'm happy to hear it said [by Khem Raj] that meta-toolchain-* targets should go away.  They easily lead to having multiple (incorrect) sysroot versions that can make (gdb remote)  debugging a futile experience.  I assume there are good practices for what should go in an image recipe vs. local.conf or especially distro.conf that minimize this (and other problems?), but the best practice I know is to promptly delete any sysroot copy installed by a meta-toolchain-* produced installer.

If anyone with saavy and bandwidth out there is taking input on which of these to attack first, I'll happily throw in a vote for Qt4.

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