Follow-up to 7e40a92732c3035003ae779022e5beaf6562375f.
* lib/arm-mes-mescc/setjmp.c (longjmp): Disable.
* lib/linux/arm-mes-mescc/mini.c (_exit): Use ldr.
(_write): Use ldr.
* lib/linux/arm-mes-mescc/syscall.c (__sys_call): Use ldr.
(__sys_call1): Use ldr.
(__sys_call2): Use ldr.
(__sys_call3): Use ldr.
(__sys_call4): Use ldr.