sci-chemistry/xcrysden: depend on virtual/opengl over media-libs/libglvnd

Signed-off-by: Patrick J. Taylor <patrick.joseph.taylor@gmail.com>

sci-chemistry/xcrysden/xcrysden-1.6.2-r2.ebuild

@@ -23,7 +23,7 @@ RDEPEND="
 	>=dev-lang/tk-8.6.12:=
 	>=dev-tcltk/togl-2.0-r3
 	>=dev-tcltk/bwidget-1.9.14
-	media-libs/libglvnd[X]
+	virtual/opengl[X]
 	sci-libs/fftw:3.0=
 	x11-libs/libX11
 "