configure & build: Rework legacy GCC detection to parse versions outside of Jam.

Jam comparison logic is string-based, and so was detecting GCC >= 10
as being < 2. This rectifies that by removing the GCC version parsing
from Jam logic entirely, and setting various BuildConfig variables
instead.

Change-Id: I0c0ae3b9002fb5e77f9ca7a78600c91871657f03
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3293
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

Build media add-ons for secondary arch.

Fixes #10049.

Build media plugins for the secondary arch.

These are used when an app uses BMediaFile/BMediaTrack, which leads to
the plug-ins being instanciated on the application side.

* Fixes one more part of #10049 (media add-ons are still missing).
* Will probably not solve any real-world issue because of #4893.

GL: Remove OpenGL kit, x86 Mesa

* Depend on Mesa packages to provide functionality

Bring the hybrid translators back into the image.

Build secondary architecture Haiku package for regular image

Also add secondary architecture packages to image.

Build media add-ons for secondary arch.

Fixes #10049.

Build media plugins for the secondary arch.

These are used when an app uses BMediaFile/BMediaTrack, which leads to
the plug-ins being instanciated on the application side.

* Fixes one more part of #10049 (media add-ons are still missing).
* Will probably not solve any real-world issue because of #4893.

GL: Remove OpenGL kit, x86 Mesa

* Depend on Mesa packages to provide functionality

Bring the hybrid translators back into the image.

Build secondary architecture Haiku package for regular image

Also add secondary architecture packages to image.