Fix value for O_mask_was_saved based on gdb observation
Fix value for O_mask_was_saved based on gdb observation

(gdb) print offsetof(struct __jmp_buf_tag, __mask_was_saved)
$12 = (int *) 0x1f0

using https://stackoverflow.com/a/39663128/2171120

wbx-github/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,wbx-github/uclibc-ng,kraj/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng,kraj/uclibc-ng