highgui: use forward slash for gl.h include

The backslash causes build failure when cross-compiling with mingw-w64

highgui: use forward slash for gl.h include
The backslash causes build failure when cross-compiling with mingw-w64
678e114e · Tony Theodore · a2fed4c7 · 678e114e
Commit 678e114e authored Feb 05, 2017 by Tony Theodore
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window_w32.cpp modules/highgui/src/window_w32.cpp +1 -1

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--- a/modules/highgui/src/window_w32.cpp
+++ b/modules/highgui/src/window_w32.cpp
@@ -65,7 +65,7 @@
 #include <vector>
 #include <functional>
 #include "opencv2/highgui.hpp"
-#include <GL\gl.h>
+#include <GL/gl.h>
 #endif

 static const char* trackbar_text =