Switch from Nz prefix to namespace Nz for linux

Former-commit-id: 64eeaf3c633254b04910ebd4576fd9e910002be0

include/Nazara/Prerequesites.hpp

@@ -116,6 +116,7 @@
 	#endif
 #elif defined(__linux__) || defined(__unix__)
 	#define NAZARA_PLATFORM_LINUX
+	#define NAZARA_PLATFORM_GLX
 	#define NAZARA_PLATFORM_POSIX
 	#define NAZARA_PLATFORM_X11
 

include/Nazara/Renderer/OpenGL.hpp

@@ -21,10 +21,10 @@
 #include <GL3/glext.h>
 #if defined(NAZARA_PLATFORM_WINDOWS)
 	#include <GL3/wglext.h>
-#elif defined(NAZARA_PLATFORM_LINUX)
+#elif defined(NAZARA_PLATFORM_GLX)
 namespace GLX
 {
-	#include <GL3/glx.h>
+	#include <GL/glx.h> // Defined in a namespace to avoid conflict
 }
 	#include <GL3/glxext.h>
 #endif
@@ -329,7 +329,7 @@ NAZARA_RENDERER_API extern PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAtt
 NAZARA_RENDERER_API extern PFNWGLGETEXTENSIONSSTRINGARBPROC  wglGetExtensionsStringARB;
 NAZARA_RENDERER_API extern PFNWGLGETEXTENSIONSSTRINGEXTPROC  wglGetExtensionsStringEXT;
 NAZARA_RENDERER_API extern PFNWGLSWAPINTERVALEXTPROC         wglSwapInterval;
-#elif defined(NAZARA_PLATFORM_LINUX)
+#elif defined(NAZARA_PLATFORM_GLX)
 NAZARA_RENDERER_API extern GLX::PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribs;
 NAZARA_RENDERER_API extern GLX::PFNGLXSWAPINTERVALEXTPROC         glXSwapIntervalEXT;
 NAZARA_RENDERER_API extern GLX::PFNGLXSWAPINTERVALMESAPROC        NzglXSwapIntervalMESA;

include/Nazara/Utility/WindowHandle.hpp

@@ -8,14 +8,16 @@
 #define NAZARA_WINDOWHANDLE_HPP
 
 #include <Nazara/Prerequesites.hpp>
+#if defined(NAZARA_PLATFORM_X11)
+#include <xcb/xcb.h>
+#endif
 
 namespace Nz
 {
 	#if defined(NAZARA_PLATFORM_WINDOWS)
 	// http://msdn.microsoft.com/en-us/library/aa383751(v=vs.85).aspx
 	typedef void* WindowHandle;
-	#elif defined(NAZARA_PLATFORM_LINUX)
-	#include <xcb/xcb.h>
+	#elif defined(NAZARA_PLATFORM_X11)
 	// http://en.wikipedia.org/wiki/Xlib#Data_types
 	using WindowHandle = xcb_window_t;
 	#else