Re-enable all tests on x86_64 and ia64.

tests/runtests.pl

@@ -1820,11 +1820,6 @@ sub singletest {
         last;
     }
 
-    my $dbghosttype=join(' ', runclientoutput("uname -a"));
-    if(($dbghosttype =~ /x86_64/) || ($dbghosttype =~ /ia64/)) {
-        $why = "debugging curl_mprintf" if($testnum != 557);
-    }
-
     if(!$why) {
         my @keywords = getpart("info", "keywords");
 	my $match;