opengl: Don't wrap shared libraries or anything already wrapped

Some QT libraries are also executables. Wrapping them breaks
linking against the library.

pkgs/opengl/insert-virtualgl.sh

@@ -247,7 +247,7 @@ VGL_autoAddVGL() {
   echo "Inserting VirtualGL into OpenGL executables in $prefix..." >&2
   for output in $outputs; do
     VGL_findS "${!output}" -type f \
-    | VGL_testKeepS 'VGL_isElfBin "$1"' \
+    | VGL_testKeepS 'VGL_isElfBin "$1" && ! [[ "$1" == .*.vgl-* ]] && ! [[ "$1" == *.so* ]]' \
     | VGL_testKeepS 'VGL_elfLibsResolvedS "$1" | VGL_isTestAnyS '"$(VGL_quote 'VGL_isLibGL "$1"')" \
     | VGL_isTestAllS 'VGL_patch "$1"'
   done