This workaround the failed compilation of cx25840-core.c:
| {standard input}: Assembler messages:
| {standard input}:583: Error: branch out of range
| {standard input}:636: Error: branch out of range
| {standard input}:40094: Error: branch out of range
These are caused by the -Wa,-mfix-loongson2f-jump, which replaces the
"jalr t9" instruction by the "or t9, t9, 0x80000000; jalr t9"
instructions, thus causing an increase in code size.
This is probably the best way to workaround the FTBFS, especially given
that the loongson-2e/2f flavour are likely going to be removed for
stretch.
d514efc4cc