win: Add compat header for sys/types.h

compat/win/sys/types.h

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_COMPAT_WIN_SYS_TYPES_H_
+#define CRASHPAD_COMPAT_WIN_SYS_TYPES_H_
+
+// This is intended to be roughly equivalent to #include_next.
+#include <../include/sys/types.h>
+
+#ifdef _WIN64
+typedef __int64 ssize_t;
+#else
+typedef _W64 int ssize_t;
+#endif
+
+#endif  // CRASHPAD_COMPAT_WIN_SYS_TYPES_H_