ktest.pl: Have -D option work without a space

Allow -DBUILD_TYPE=boot work the same as -D BUILD_TYPE=boot just like
normal single character option does in most applications.

Cc: "John Warthog9 Hawley" <[email protected]>
Cc: Dhaval Giani <[email protected]>
Cc: Greg KH <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Steven Rostedt <[email protected]>

Author: rostedt

tools/testing/ktest/ktest.pl

@@ -4297,6 +4297,15 @@ sub die_usage {
 	    $command_vars[$#command_vars + 1] = $val;
 	}
 
+    } elsif ( $ARGV[0] =~ m/^-D(.*)/) {
+	my $val = $1;
+	shift;
+
+	if ($val =~ m/(.*?):=(.*)$/) {
+	    set_variable($1, $2, 1);
+	} else {
+	    $command_vars[$#command_vars + 1] = $val;
+	}
     } elsif ( $ARGV[0] eq "-h" ) {
 	die_usage;
     } else {