collapse plibpth to one line and remove trailing /

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, and also remove trailing /'s.

(The collapsing is a more robust version of the previous commit,
since reverted, that davem wrote independently).

Author: doughera88

hints/linux.sh

@@ -164,8 +164,10 @@ esac
 # plibpth to bypass this check.
 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
+	cut -f2- -d= | tr ':' $trnl | grep -v 'gcc' | sed -e 's:/$::'`
+    set X $plibpth # Collapse all entries on one line
+    shift
+    plibpth="$*"
     ;;
 esac