fix for mingw

configure.ac

@@ -47,7 +47,7 @@ m4_include([libev/libev.m4])
 dnl Add library for mingw
 case $host in
   *-mingw*)
-    LIBS="$LIBS -lgdi32 -lws2_32 -lcrypt32"
+    LIBS="$LIBS -ladvapi32 -lgdi32 -lws2_32 -lcrypt32"
     ;;
   *)
     ;;

libsodium/src/libsodium/sodium/utils.c

@@ -19,6 +19,11 @@
 #ifdef _WIN32
 # include <windows.h>
 # include <wincrypt.h>
+#ifdef __MINGW32__
+#ifndef SecureZeroMemory
+#define SecureZeroMemory(p,s) RtlFillMemory((p),(s),0)
+#endif
+#endif
 #else
 # include <unistd.h>
 #endif