It's unclear why Buildroot only defined MIPS 32/64 releases 1, 2, 5 and 6
while 3 exists as well.
Interesting fact:
"Release 4 was skipped because the number four is perceived as unlucky in
many Asian cultures."
https://en.wikipedia.org/wiki/MIPS_architecture#MIPS32/MIPS64
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>