collapse plibpth to one line

The recent change to hints/linux.sh,
40f0262
set the plibpth variable.
It was supposed to set all entries on a single line, but it didn't.
Do it now,

Author: iabyn

hints/linux.sh

@@ -165,7 +165,8 @@ esac
 case "$plibpth" in
 '') plibpth=`gcc -print-search-dirs | grep libraries |
 	cut -f2- -d= | tr ':' $trnl | grep -v 'gcc'`
-    plibpth="$plibpth"  # Collapse all entries on one line
+    set $plibpth
+    plibpth="$@"  # Collapse all entries on one line
     ;;
 esac