Added conditional compilation for each OS

lib/sys/sys_mac.q

@@ -0,0 +1,27 @@
+read(fd Int, address Pointer, length Int) -> Int {
+	return syscall(0x2000003, fd, address, length)
+}
+
+write(fd Int, address Pointer, length Int) -> Int {
+	return syscall(0x2000004, fd, address, length)
+}
+
+open(file Pointer, flags Int, mode Int) -> Int {
+	return syscall(0x2000005, file, flags, mode)
+}
+
+close(fd Int) -> Int {
+	return syscall(0x2000006, fd)
+}
+
+mmap(address Int, length Int, protection Int, flags Int) -> Pointer {
+	return syscall(0x20000C5, address, length, protection, flags)
+}
+
+munmap(address Pointer, length Int) -> Int {
+	return syscall(0x2000049, address, length)
+}
+
+exit(status Int) {
+	syscall(0x2000001, status)
+}