eglfs: fix x11 header related compile failure

Add egl config and QT_EGL_NO_X11 define (as all other eglfs project
files do).

Task-number: QTBUG-59427
Change-Id: Ifbb11eae0fdf0e58c0b7feecb9a7914a889c8f77
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/plugins/platforms/eglfs/eglfs-plugin.pro

@@ -2,6 +2,11 @@ TARGET = qeglfs
 
 QT += eglfsdeviceintegration-private
 
+CONFIG += egl
+
+# Avoid X11 header collision, use generic EGL native types
+DEFINES += QT_EGL_NO_X11
+
 SOURCES += $$PWD/qeglfsmain.cpp
 
 OTHER_FILES += $$PWD/eglfs.json