[PATCH] Update list of supported platforms in configure.ac error message

[Alan Coopersmith]

Adds DragonFly BSD, OpenSolaris, & GNU Hurd.
Drops MacOS X, since this is in the section specific to the Xorg/XFree86 DDX.
(Matches the OS patterns the configure script checks for.)

Also uses m4 macros to fix the spacing/formatting of the resulting message.

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 configure.ac |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6110d8c..859886c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1704,9 +1704,11 @@ if test "x$XORG" = xyes; then
 	  *)
 	  	XORG_OS="unknown"
 		XORG_OS_SUBDIR="unknown"
-		AC_MSG_ERROR([Your OS is unknown. Xorg currently only supports Linux, \
-		Free/Open/NetBSD, Solaris, and OS X. If you are interested in porting \
-	        Xorg to your platform, please email xorg at lists.freedesktop.org.])
+		AC_MSG_ERROR([m4_text_wrap(m4_join([ ],
+		[Your OS is unknown. Xorg currently only supports Linux,],
+		[Free/Open/Net/DragonFlyBSD, Solaris/OpenSolaris, & GNU Hurd.],
+		[If you are interested in porting Xorg to your platform,],
+		[please email xorg at lists.freedesktop.org.]))])
 		;;
 	esac
 
-- 
1.5.6.5