x/sys/unix: add type specific ioctl functions for termios on solaris

The existing code has no way to manipulate termios or winsize structures
on solaris.  This change adds IoctlGetXXX and IoctlSetXXX functions for
int, termios, termio, and winsize.  The embedded awk script in
mkerrors.sh has additional patterns to generate the needed ioctl
constants for these calls.

Fixes golang/go#12574

Change-Id: Ic62a8c698d42c8ca379c90f71e9f27635e7d03b5
Reviewed-on: https://go-review.googlesource.com/14587
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>

unix/mkerrors.sh

@@ -309,6 +309,9 @@ ccflags="$@"
 		$2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P)_/ ||
 		$2 ~ /^SIOC/ ||
 		$2 ~ /^TIOC/ ||
+		$2 ~ /^TCGET/ ||
+		$2 ~ /^TCSET/ ||
+		$2 ~ /^TC(FLSH|SBRK|XONC)$/ ||
 		$2 !~ "RTF_BITS" &&
 		$2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
 		$2 ~ /^BIOC/ ||