Unix: move from syscall to golang.org/x/sys/unix

Prepare to using `unix.TCFLSH`/`unix.TIOCFLUSH`
which is missing in `syscall` package

serial_linux.go

@@ -6,7 +6,7 @@
 
 package serial // import "go.bug.st/serial.v1"
 
-import "syscall"
+import "golang.org/x/sys/unix"
 
 const devFolder = "/dev"
 const regexFilter = "(ttyS|ttyUSB|ttyACM|ttyAMA|rfcomm|ttyO)[0-9]{1,3}"
@@ -14,51 +14,51 @@ const regexFilter = "(ttyS|ttyUSB|ttyACM|ttyAMA|rfcomm|ttyO)[0-9]{1,3}"
 // termios manipulation functions
 
 var baudrateMap = map[int]uint32{
-	0:       syscall.B9600, // Default to 9600
-	50:      syscall.B50,
-	75:      syscall.B75,
-	110:     syscall.B110,
-	134:     syscall.B134,
-	150:     syscall.B150,
-	200:     syscall.B200,
-	300:     syscall.B300,
-	600:     syscall.B600,
-	1200:    syscall.B1200,
-	1800:    syscall.B1800,
-	2400:    syscall.B2400,
-	4800:    syscall.B4800,
-	9600:    syscall.B9600,
-	19200:   syscall.B19200,
-	38400:   syscall.B38400,
-	57600:   syscall.B57600,
-	115200:  syscall.B115200,
-	230400:  syscall.B230400,
-	460800:  syscall.B460800,
-	500000:  syscall.B500000,
-	576000:  syscall.B576000,
-	921600:  syscall.B921600,
-	1000000: syscall.B1000000,
-	1152000: syscall.B1152000,
-	1500000: syscall.B1500000,
-	2000000: syscall.B2000000,
-	2500000: syscall.B2500000,
-	3000000: syscall.B3000000,
-	3500000: syscall.B3500000,
-	4000000: syscall.B4000000,
+	0:       unix.B9600, // Default to 9600
+	50:      unix.B50,
+	75:      unix.B75,
+	110:     unix.B110,
+	134:     unix.B134,
+	150:     unix.B150,
+	200:     unix.B200,
+	300:     unix.B300,
+	600:     unix.B600,
+	1200:    unix.B1200,
+	1800:    unix.B1800,
+	2400:    unix.B2400,
+	4800:    unix.B4800,
+	9600:    unix.B9600,
+	19200:   unix.B19200,
+	38400:   unix.B38400,
+	57600:   unix.B57600,
+	115200:  unix.B115200,
+	230400:  unix.B230400,
+	460800:  unix.B460800,
+	500000:  unix.B500000,
+	576000:  unix.B576000,
+	921600:  unix.B921600,
+	1000000: unix.B1000000,
+	1152000: unix.B1152000,
+	1500000: unix.B1500000,
+	2000000: unix.B2000000,
+	2500000: unix.B2500000,
+	3000000: unix.B3000000,
+	3500000: unix.B3500000,
+	4000000: unix.B4000000,
 }
 
 var databitsMap = map[int]uint32{
-	0: syscall.CS8, // Default to 8 bits
-	5: syscall.CS5,
-	6: syscall.CS6,
-	7: syscall.CS7,
-	8: syscall.CS8,
+	0: unix.CS8, // Default to 8 bits
+	5: unix.CS5,
+	6: unix.CS6,
+	7: unix.CS7,
+	8: unix.CS8,
 }
 
 const tcCMSPAR uint32 = 0 // may be CMSPAR or PAREXT
-const tcIUCLC = syscall.IUCLC
+const tcIUCLC = unix.IUCLC
 
 const tcCRTSCTS uint32 = 0x80000000
 
-const ioctlTcgetattr = syscall.TCGETS
-const ioctlTcsetattr = syscall.TCSETS
+const ioctlTcgetattr = unix.TCGETS
+const ioctlTcsetattr = unix.TCSETS