opengl.gl: just add libGL.so.1 instead of using find-library-from-list.

I think this is more robust, and also I would rather have find-library
return full paths on all platforms since that's the utility that I was
going for when it was written.

basis/opengl/gl/gl.factor

@@ -2,9 +2,8 @@
 ! See http://factorcode.org/license.txt for BSD license.
 
 ! This file is based on the gl.h that comes with xorg-x11 6.8.2
-USING: alien alien.c-types alien.libraries
-alien.libraries.finder alien.syntax io.encodings.ascii kernel
-opengl.gl.extensions system ;
+USING: alien alien.c-types alien.libraries alien.syntax
+io.encodings.ascii kernel opengl.gl.extensions system ;
 FROM: alien.c-types => short ;
 IN: opengl.gl
 
@@ -630,7 +629,7 @@ LIBRARY: gl
 
 <<
 os linux? [
-    "gl" { "libGL.so.1" "libGL.so" } find-library-from-list cdecl add-library
+    "gl" "libGL.so.1" cdecl add-library
 ] when
 >>