[libxml2] Small patch to accomodate the Haiku OS

[Daniel Veillard <veillard src gnome org>]

commit 508a8d68a6b8c9ed4ff280928bb124b81dd274ec
Author: Scott McCreary <scottmc2 gmail com>
Date:   Mon Aug 24 16:35:35 2009 +0200

    Small patch to accomodate the Haiku OS
    
    * configure.in: keep M_LIBS to empty

 configure.in |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.in b/configure.in
index 514b7da..5a3974e 100644
--- a/configure.in
+++ b/configure.in
@@ -1286,6 +1286,8 @@ case "$host" in
 	;;
 	*beos*) M_LIBS=""
 	;;
+        *haiku*) M_LIBS=""
+        ;;
 	*) M_LIBS="-lm"
 	;;
 esac