buildroot

package/binutils: fix crash caused by buggy xtensa overlay

In some xtensa configurations there may be system/user registers in
xtensa-modules with negative index. ISA initialization for such config
may clobber heap and result in program termination.
Don't update lookup table entries for register with negative indices.

[Peter: drop 2.28.x/2.29.x variants]
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 83f7fb0d5bdbae3c50bac0eb1d4efe1c71692af8)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>