[visionOS] build-webkit tries to build ImageDiff for visionOS, not macOS

rdar://128579426
https://bugs.webkit.org/show_bug.cgi?id=274564

Unreviewed build fix.

Add --visionos to the list of arguments that get stripped from
build-webkit when calling build-imagediff.

Before:
    > perl -ITools/Scripts -Mwebkitdirs -e 'print extractNonMacOSHostConfiguration(\@argv)' -- --visionos-device
    --visionos-device

After:
    > perl -ITools/Scripts -Mwebkitdirs -e 'print extractNonMacOSHostConfiguration(\@argv)' -- --visionos-device

* Tools/Scripts/webkitdirs.pm:
(extractNonMacOSHostConfiguration):

Canonical link: https://commits.webkit.org/279173@main

Tools/Scripts/webkitdirs.pm

@@ -852,7 +852,7 @@ sub argumentsForConfiguration()
 sub extractNonMacOSHostConfiguration
 {
     my @args = ();
-    my @extract = ('--device', '--gtk', '--ios', '--platform', '--sdk', '--simulator', '--wincairo', '--tvos', '--watchos', 'SDKROOT', 'ARCHS');
+    my @extract = ('--device', '--gtk', '--ios', '--platform', '--sdk', '--simulator', '--wincairo', '--tvos', '--visionos', '--watchos', 'SDKROOT', 'ARCHS');
     foreach (@{$_[0]}) {
         my $line = $_;
         my $flag = 0;