x11-servers/xorg-server: patch to utilize CLOCK_MONOTONIC_FAST for the clock

This patches the X server to use CLOCK_MONOTONIC_FAST instead of
CLOCK_MONOTONIC for the clock.  This is basically a reintroduction of
r208485 by jkim@ that was removed by accident(?).

Since the X server is fine with the Linux _COARSE clock the accuracy of
the FreeBSD _FAST clock should work too.  I have run with this patch for
a long time without ill effects.

PR:		252816
Reviewed by:	imp, markj, jkim, mhorne
Approved by:	x11

x11-servers/xorg-server/Makefile

@@ -2,7 +2,7 @@
 
 PORTNAME?=	xorg-server
 PORTVERSION?=	1.20.11
-PORTREVISION?=	2
+PORTREVISION?=	3
 PORTEPOCH?=	1
 CATEGORIES=	x11-servers
 MASTER_SITES=	XORG/individual/xserver

x11-servers/xorg-server/files/patch-os-utils.c

@@ -0,0 +1,18 @@
+--- os/utils.c.orig	2014-04-15 01:01:57 UTC
++++ os/utils.c
+@@ -443,11 +443,11 @@ GetTimeInMillis(void)
+     static clockid_t clockid;
+ 
+     if (!clockid) {
+-#ifdef CLOCK_MONOTONIC_COARSE
+-        if (clock_getres(CLOCK_MONOTONIC_COARSE, &tp) == 0 &&
++#ifdef CLOCK_MONOTONIC_FAST
++        if (clock_getres(CLOCK_MONOTONIC_FAST, &tp) == 0 &&
+             (tp.tv_nsec / 1000) <= 1000 &&
+-            clock_gettime(CLOCK_MONOTONIC_COARSE, &tp) == 0)
+-            clockid = CLOCK_MONOTONIC_COARSE;
++            clock_gettime(CLOCK_MONOTONIC_FAST, &tp) == 0)
++            clockid = CLOCK_MONOTONIC_FAST;
+         else
+ #endif
+         if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0)