opengl: VirtualGL trailing deliminator issue causing rpath skippage

Bash read returns false if trailing deliminator is not found causing
the while read -d ':' loop to not process the last rpath entry.

pkgs/opengl/insert-virtualgl.sh

@@ -7,13 +7,13 @@ VGL_quote() {
 
 # Stream producers
 #
-# These produce a stream of escaped new-line separated items
+# These produce a stream of escaped new-line terminated items
 #
 
 # Stream the given arguments
 #
 VGL_sourceS() {
-  printf '%q\n' "$@"
+  (( $# == 0 )) || printf '%q\n' "$@"
 }
 
 # Stream the results of find (correctly escapes all filenames)
@@ -61,15 +61,16 @@ VGL_elfRPathS() {
   declare file=$1 entry
   patchelf --print-rpath "$file" |
     while read -d ':' -r entry; do
-      VGL_sourceS "$entry"
+      [[ -z $entry ]] || VGL_sourceS "$entry"
     done
+    [[ -z $entry ]] || VGL_sourceS "$entry"
 }
 
 
 
 # Stream transformers
 #
-# Take in a set of options and transform a stream of new-line separated items
+# Take in a set of options and transform to a stream of new-line terminated items
 #
 
 # Remove all items for which the given command returns false
@@ -111,7 +112,7 @@ VGL_testSuffixNoneS() {
 
 # Stream consumers
 #
-# These consume a stream of escaped new-line separated items
+# These consume a stream of escaped new-line terminated items (termination is required for processing)
 #
 
 # Return true iff given command returns true for some item