removed warning


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1142 c046a42c-6fe2-441c-8c8c-71466251a162

slirp/slirp.h

diff --git a/slirp/slirp.h b/slirp/slirp.h
index fb55ad9..1bb189d 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -331,6 +331,7 @@
 #endif
 
 #ifdef _WIN32
+#undef errno
 #define errno (WSAGetLastError())
 #endif