Fix attempting to load libX11 when rendering headless.

Bug 26776258

Change-Id: I326e76d2650b3992835d74baea159b13f14b2e3e
Reviewed-on: https://swiftshader-review.googlesource.com/4720
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/OpenGL/libEGL/main.h

diff --git a/src/OpenGL/libEGL/main.h b/src/OpenGL/libEGL/main.h
index 27e6ef6..8bdfcb2 100644
--- a/src/OpenGL/libEGL/main.h
+++ b/src/OpenGL/libEGL/main.h
@@ -30,7 +30,7 @@
 	{
 		EGLint error;
 		EGLenum API;
-		Display *display;
+		EGLDisplay display;
 		Context *context;
 		Surface *drawSurface;
 		Surface *readSurface;
@@ -42,8 +42,8 @@
 	void setCurrentAPI(EGLenum API);
 	EGLenum getCurrentAPI();
 
-	void setCurrentDisplay(Display *dpy);
-	Display *getCurrentDisplay();
+	void setCurrentDisplay(EGLDisplay dpy);
+	EGLDisplay getCurrentDisplay();
 
 	void setCurrentContext(Context *ctx);
 	Context *getCurrentContext();
@@ -55,7 +55,7 @@
 	Surface *getCurrentReadSurface();
 
 	void error(EGLint errorCode);
-	
+
 	template<class T>
 	const T &error(EGLint errorCode, const T &returnValue)
 	{