Implemented more arm64 instructions

lib/sys/sys_linux_arm.q

@@ -0,0 +1,15 @@
+read(fd int, buffer *byte, length int) -> int {
+	return syscall(63, fd, buffer, length)
+}
+
+write(fd int, buffer *byte, length int) -> int {
+	return syscall(64, fd, buffer, length)
+}
+
+mmap(address int, length uint, protection int, flags int) -> *any {
+	return syscall(222, address, length, protection, flags)
+}
+
+munmap(address *any, length uint) -> int {
+	return syscall(215, address, length)
+}