[libxml2] fixup regression in Various "make distcheck" and portability fixups

[Daniel Veillard <veillard src gnome org>]

commit 8886f335c74126bc21035c17608868ca6abb8758
Author: Roumen Petrov <bugtrack roumenpetrov info>
Date:   Mon Aug 13 16:38:09 2012 +0800

    fixup regression in Various "make distcheck" and portability fixups
    
    Was using the wrong variable and adds proper m4 quoting

 configure.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.in b/configure.in
index 174eb9b..321b1f2 100644
--- a/configure.in
+++ b/configure.in
@@ -1021,7 +1021,7 @@ AC_SUBST(BASE_THREAD_LIBS)
 AC_SUBST(WITH_THREADS)
 AC_SUBST(THREAD_CFLAGS)
 AC_SUBST(TEST_THREADS)
-AM_CONDITIONAL(THREADS_W32, test -n "$THREADS_WIN32")
+AM_CONDITIONAL([THREADS_W32],[test -n "$THREADS_W32"])
 
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