tricore container toolchain build broken again

[Peter Maydell]

The tricore container toolchain build is still not reliable.

Latest failure:
https://gitlab.com/qemu-project/qemu/-/jobs/3710561054

#6 43.63 ldlex.l: In function 'yy_input':
#6 43.63 ldlex.l:615:7: error: 'yy_current_buffer' undeclared (first
use in this function); did you mean 'yy_create_buffer'?
#6 43.63 {
#6 43.63 ^
#6 43.63 yy_create_buffer

Any ideas ?

thanks
-- PMM