runtests: assume a newer Valgrind by default

The tests for an older Valgrind version should probably just be deleted,
given that they're testing for an 18-year-old version.

tests/runner.pm

@@ -64,8 +64,8 @@ use globalconfig;
 #######################################################################
 # Global variables set elsewhere but used only by this package
 our $DBGCURL=$CURL; #"../src/.libs/curl";  # alternative for debugging
-our $valgrind_logfile="--logfile";  # the option name for valgrind 2.X
-our $valgrind_tool;
+our $valgrind_logfile="--log-file";  # the option name for valgrind >=3
+our $valgrind_tool="--tool=memcheck";
 our $gdb = checktestcmd("gdb");
 our $gdbthis;      # run test case with gdb debugger
 our $gdbxwin;      # use windowed gdb when using gdb

tests/runtests.pl

@@ -2329,9 +2329,11 @@ if($valgrind) {
 
         # since valgrind 2.1.x, '--tool' option is mandatory
         # use it, if it is supported by the version installed on the system
+        # (this happened in 2003, so we could probably don't need to care about
+        # that old version any longer and just delete this check)
         runclient("valgrind --help 2>&1 | grep -- --tool > /dev/null 2>&1");
-        if (($? >> 8)==0) {
-            $valgrind_tool="--tool=memcheck";
+        if (($? >> 8)) {
+            $valgrind_tool="";
         }
         open(my $curlh, "<", "$CURL");
         my $l = <$curlh>;
@@ -2342,14 +2344,16 @@ if($valgrind) {
         close($curlh);
 
         # valgrind 3 renamed the --logfile option to --log-file!!!
+        # (this happened in 2005, so we could probably don't need to care about
+        # that old version any longer and just delete this check)
         my $ver=join(' ', runclientoutput("valgrind --version"));
         # cut off all but digits and dots
         $ver =~ s/[^0-9.]//g;
 
         if($ver =~ /^(\d+)/) {
             $ver = $1;
-            if($ver >= 3) {
-                $valgrind_logfile="--log-file";
+            if($ver < 3) {
+                $valgrind_logfile="--logfile";
             }
         }
     }