libevent: Windows reuseaddr workaround in depends

Make it possible to reuse sockets.
This is necessary to make the RPC tests work in WINE.

depends/packages/libevent.mk

@@ -3,6 +3,11 @@ $(package)_version=2.0.22
 $(package)_download_path=https://github.com/libevent/libevent/releases/download/release-2.0.22-stable
 $(package)_file_name=$(package)-$($(package)_version)-stable.tar.gz
 $(package)_sha256_hash=71c2c49f0adadacfdbe6332a372c38cf9c8b7895bb73dabeaa53cdcc1d4e1fa3
+$(package)_patches=reuseaddr.patch
+
+define $(package)_preprocess_cmds
+  patch -p1 < $($(package)_patch_dir)/reuseaddr.patch
+endef
 
 define $(package)_set_vars
   $(package)_config_opts=--disable-shared --disable-openssl --disable-libevent-regress

depends/patches/libevent/reuseaddr.patch

@@ -0,0 +1,21 @@
+--- old/evutil.c   2015-08-28 19:26:23.488765923 -0400
++++ new/evutil.c   2015-08-28 19:27:41.392767019 -0400
+@@ -321,15 +321,16 @@
+ int
+ evutil_make_listen_socket_reuseable(evutil_socket_t sock)
+ {
+-#ifndef WIN32
+ 	int one = 1;
++#ifndef WIN32
+ 	/* REUSEADDR on Unix means, "don't hang on to this address after the
+ 	 * listener is closed."  On Windows, though, it means "don't keep other
+ 	 * processes from binding to this address while we're using it. */
+ 	return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &one,
+ 	    (ev_socklen_t)sizeof(one));
+ #else
+-	return 0;
++	return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*) &one,
++		(ev_socklen_t)sizeof(one));
+ #endif
+ }
+