Remove egl display type setenv hack

No longer needed with mesa 7.12-devel egl display autodetection.

clients/simple-egl.c

@@ -106,7 +106,6 @@ init_egl(struct display *display)
 	EGLint major, minor, n;
 	EGLBoolean ret;
 
-	setenv("EGL_PLATFORM", "wayland", 1);
 	display->egl.dpy = eglGetDisplay(display->display);
 	assert(display->egl.dpy);
 

clients/window.c

@@ -1852,7 +1852,6 @@ init_egl(struct display *d)
 		EGL_NONE
 	};
 
-	setenv("EGL_PLATFORM", "wayland", 1);
 	d->dpy = eglGetDisplay(d->display);
 	if (!eglInitialize(d->dpy, &major, &minor)) {
 		fprintf(stderr, "failed to initialize display\n");