Add dlfcn-win32 to third_party

third_party/dlfcn-win32/dlfcn.h

+/*
+ * dlfcn-win32
+ * Copyright (c) 2007 Ramiro Polla
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef DLFCN_H
+#define DLFCN_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* POSIX says these are implementation-defined.
+ * To simplify use with Windows API, we treat them the same way.
+ */
+
+#define RTLD_LAZY   0
+#define RTLD_NOW    0
+
+#define RTLD_GLOBAL (1 << 1)
+#define RTLD_LOCAL  (1 << 2)
+
+/* These two were added in The Open Group Base Specifications Issue 6.
+ * Note: All other RTLD_* flags in any dlfcn.h are not standard compliant.
+ */
+
+#define RTLD_DEFAULT    0
+#define RTLD_NEXT       0
+
+void *dlopen ( const char *file, int mode );
+int   dlclose( void *handle );
+void *dlsym  ( void *handle, const char *name );
+char *dlerror( void );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DLFCN_H */