Since gcc 11 [1] the sparc architecture is disabled since
it produce a non working image. Buildroot now provide gcc
13.x, 12.x and 11.x and we are going to remove gcc 10
that was the last working release (thanks to a local patch).
We have to disable the internal toolchain backend for sparc
before removing gcc 10. While at it, remove !BR2_sparc
dependency for gcc 11.x, 12.x and 13.x.
[1] 2ab88dac29
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>