sci-chemistry/xcrysden: relax needlessly strict dependencies

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

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

@@ -18,11 +18,11 @@ SLOT="0"
 KEYWORDS="~amd64"
 
 RDEPEND="
-	>=virtual/glu-9.0-r2
-	>=dev-lang/tcl-8.6.12:=
-	>=dev-lang/tk-8.6.12:=
-	>=dev-tcltk/togl-2.0-r3
-	>=dev-tcltk/bwidget-1.9.14
+	virtual/glu
+	dev-lang/tcl:=
+	dev-lang/tk:=
+	>=dev-tcltk/togl-2.0
+	dev-tcltk/bwidget
 	virtual/opengl[X]
 	sci-libs/fftw:3.0=
 	x11-libs/libX11