sys_mbox_tryfetch macro

For now, we map straight to sys_arch implementation.

Syntax

#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)

Location	Text
sys.h:71	#define sys_mbox_tryfetch(m,d)
sys.h:360	#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)
api_msg.c:839	while (sys_mbox_tryfetch(&conn->recvmbox, &mem) != SYS_MBOX_EMPTY) {
api_msg.c:864	while (sys_mbox_tryfetch(&conn->acceptmbox, &mem) != SYS_MBOX_EMPTY) {