MSVC missing includes

src/bitmask.h

@@ -9,6 +9,7 @@
 #include <ostream>
 #include <stdexcept>
 #include <vector>
+#include <algorithm>
 #include <cstdint>
 
 #include <pvxs/version.h>

src/evhelper.cpp

@@ -4,13 +4,17 @@
  * in file LICENSE that is included with this distribution.
  */
 
+#include <osiSock.h>
+
 #ifdef _WIN32
-#include <mswsock.h>
+#  include <windows.h>
+#  include <mswsock.h>
 #endif
 
 #include <cstring>
 #include <system_error>
 #include <deque>
+#include <algorithm>
 
 #include <event2/event.h>
 #include <event2/thread.h>

src/utilpvt.h

@@ -6,8 +6,11 @@
 #ifndef UTILPVT_H
 #define UTILPVT_H
 
+#include <osiSock.h>
 
 #ifdef _WIN32
+#  define WIN32_LEAN_AND_MEAN
+#  include <windows.h>
 #  include <synchapi.h>
 #else
 #  include <pthread.h>