contrib/wix/locale.wxs

largefiles: avoid redundant changectx looking up at each repetitions

These code paths look up changectx at each repetitions, even though
the changectx key isn't changed while loop.

<?xml version="1.0" encoding="utf-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">

  <?include defines.wxi ?>

  <?define hglocales =
    da;de;el;fr;it;ja;pt_BR;sv;zh_CN;zh_TW
  ?>

  <Fragment>
    <ComponentGroup Id="localeFolder">
      <?foreach LOC in $(var.hglocales) ?>
        <ComponentRef Id="hg.locale.$(var.LOC)"/>
      <?endforeach?>
    </ComponentGroup>
  </Fragment>

  <Fragment>
    <DirectoryRef Id="INSTALLDIR">
      <Directory Id="localedir" Name="locale" FileSource="$(var.SourceDir)">
        <?foreach LOC in $(var.hglocales) ?>
          <Directory Id="hg.locale.$(var.LOC)" Name="$(var.LOC)">
            <Directory Id="hg.locale.$(var.LOC).LC_MESSAGES" Name="LC_MESSAGES">
              <Component Id="hg.locale.$(var.LOC)" Guid="*" Win64='$(var.IsX64)'>
                <File Id="hg.mo.$(var.LOC)" Name="hg.mo" KeyPath="yes" />
              </Component>
            </Directory>
          </Directory>
        <?endforeach?>
      </Directory>
    </DirectoryRef>
  </Fragment>

</Wix>