Fix two VPath-related bugs in bench.

* bench/ltl2tgba/known (ltlfile): Add a $srcdir.
* bench/ltlclasses/defs.in (builddir): Add the $builddir.
* bench/ltlclasses/run (gen): Change the $srcdir into $builddir.

bench/ltl2tgba/known

@@ -28,7 +28,7 @@
 conffile=known.cfg
 logfile=known.log
 sumfile=known.txt
-ltlfile=formulae.ltl
+ltlfile=$srcdir/formulae.ltl
 
 . "$srcdir/algorithms"
 

bench/ltlclasses/defs.in

@@ -27,6 +27,7 @@ test -f ./defs || {
 }
 
 srcdir='@srcdir@'
+builddir='@builddir@'
 
 # Ensure $srcdir is set correctly.
 test -f "$srcdir/defs.in" || {

bench/ltlclasses/run

@@ -22,7 +22,7 @@
 
 . ./defs
 
-gen="$srcdir/../../src/ltltest/genltl"
+gen="$builddir/../../src/ltltest/genltl"
 
 for F in 1 2 3 4 5; do
   echo "# Benching ltl2tgba_fm for family F=$F"