Stop looking for expect and runtest above top_builddir

Users wishing to test hand-compiled versions of expect and runtest can
easily enough put them in their path or set EXPECT and RUNTEST
themselves.

testsuite/Makefile.am

@@ -2,15 +2,6 @@
 
 AUTOMAKE_OPTIONS = foreign dejagnu
 
-# Setup the testing framework, if you have one
-EXPECT = `if [ -f $(top_builddir)/../expect/expect ] ; then \
-            echo $(top_builddir)/../expect/expect ; \
-          else echo expect ; fi`
-
-RUNTEST = `if [ -f $(top_srcdir)/../dejagnu/runtest ] ; then \
-	       echo $(top_srcdir)/../dejagnu/runtest ; \
-	    else echo runtest; fi`
-
 EXTRA_DEJAGNU_SITE_CONFIG=../local.exp
 
 CLEANFILES = *.exe core* *.log *.sum