[gupnp] Initialize os_win32 to "no" to fix linux compilation.

[Jens Georg <jensgeorg src gnome org>]

commit d8cadeda8aa3017192332c8d749856ef6ec731f8
Author: Alban Browaeys <prahal yahoo com>
Date:   Thu Nov 1 07:39:41 2012 +0100

    Initialize os_win32 to "no" to fix linux compilation.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=687320

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0fd0b4d..8f60192 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,7 @@ PKG_CHECK_MODULES(GTest, glib-2.0 >= 2.16, [gtest=yes], [gtest=no])
 AM_CONDITIONAL(HAVE_GTEST, [test x$gtest = xyes])
 
 AC_MSG_CHECKING([operating system])
+os_win32=no
 case "$target_os" in
      mingw*|cygwin*)
         os_win32=yes