From 1113f62865c93365d594f36d90adff1844ce1665 Mon Sep 17 00:00:00 2001
From: Nil Geisweiller <ngeiswei@gmail.com>
Date: Tue, 5 Jan 2021 18:25:49 +0200
Subject: [PATCH] Add missing STL stack include
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Otherwise, on gcc 10.2.0, it complains with the error message:

```
In file included from /home/nilg/MalmoPlatform/Malmo/src/VideoFrameWriter.cpp:27:
/home/nilg/MalmoPlatform/Malmo/src/PosixFrameWriter.h:48:21: error: ‘stack’ in namespace ‘std’ does not name a template type
   48 |         static std::stack<pid_fd> child_process_stack;
      |                     ^~~~~
In file included from /home/nilg/MalmoPlatform/Malmo/src/VideoFrameWriter.cpp:27:
/home/nilg/MalmoPlatform/Malmo/src/PosixFrameWriter.h:1:1: note: ‘std::stack’ is defined in header ‘<stack>’; did you forget to ‘#include <stack>’?
  +++ |+#include <stack>
    1 | // --------------------------------------------------------------------------------------------------
```
---
 Malmo/src/PosixFrameWriter.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Malmo/src/PosixFrameWriter.h b/Malmo/src/PosixFrameWriter.h
index f97a9be51..62d1307b7 100755
--- a/Malmo/src/PosixFrameWriter.h
+++ b/Malmo/src/PosixFrameWriter.h
@@ -23,6 +23,9 @@
 // Local:
 #include "VideoFrameWriter.h"
 
+// STL:
+#include <stack>
+
 namespace malmo
 {
     class PosixFrameWriter : public VideoFrameWriter