Call tests with executable name.

tests/ChangeLog

@@ -1,3 +1,8 @@
+2008-11-06  Steven Schubiger  <stsc@members.fsf.org>
+
+	* run-px: When executing test scripts, invoke them with the
+	current perl executable name as determined by env.
+
 2008-11-06  Micah Cowan  <micah@cowan.name>
 
 	* run-px: Use strict (thanks Steven Schubiger!).

tests/run-px

@@ -52,7 +52,7 @@ my @results;
 
 for my $test (@tests) {
     print "Running $test\n\n";
-    system("$top_srcdir/tests/$test");
+    system("$^X $top_srcdir/tests/$test");
     push @results, $?;
 }