RISC-V: Allow long jumps to __syscall_error

__syscall_error may end up farther than 1MiB away from a caller,
especially when linking statically large binaries. tail allows for
4GiB jumps and is reduced to j when a linked symbol is within range.

Fixes: 36960f0c ("RISC-V: Linux Syscall Interface")
Fixes: 7f33b09c ("RISC-V: Linux ABI")
Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>