synthrepo: add missing import of sys
Found using Cython.
<Include>
<!-- These are component GUIDs used for Mercurial installers.
YOU MUST CHANGE ALL GUIDs below when copying this file
and replace 'Mercurial' in this notice with the name of
your project. Component GUIDs have global namespace! -->
<!-- contrib.wxs -->
<?define contrib.guid = {F17D27B7-4A6B-4cd2-AE72-FED3CFAA585E} ?>
<?define contrib.vim.guid = {BB04903A-652D-4C4F-9590-2BD07A2304F2} ?>
<!-- dist.wxs -->
<?define dist.guid = {C3B634A4-1B05-4A40-94A9-38EE853CF693} ?>
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<?define doc.hgignore.5.html.guid = {AA9118C4-F3A0-4429-A5F4-5A1906B2D67F} ?>
<?define doc.hgrc.5.html = {E0CEA1EB-FA01-408c-844B-EE5965165BAE} ?>
<?define doc.style.css = {172F8262-98E0-4711-BD39-4DAE0D77EF05} ?>
<!-- help.wxs -->
<?define helpFolder.guid = {9FA957DB-6DFE-44f2-AD03-293B2791CF17} ?>
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<?define i18nFolder.guid = {1BF8026D-CF7C-4174-AEE6-D6B7BF119248} ?>
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<?define templates.paper.guid = {61AB1DE9-645F-46ED-8AF8-0CF02267FFBB} ?>
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<?define templates.rss.guid = {36069748-1E2A-472B-A212-506CB656A9C1} ?>
<?define templates.spartan.guid = {80222625-FA8F-44b1-86CE-1781EF375D09} ?>
<?define templates.static.guid = {B27D7311-050A-4A96-9971-B674A0EA21D0} ?>
<!-- mercurial.wxs -->
<?define ProductUpgradeCode = {A1CC6134-E945-4399-BE36-EB0017FDF7CF} ?>
<?define ComponentMainExecutableGUID = {D102B8FA-059B-4ACC-9FA3-8C78C3B58EEF} ?>
<?define ReadMe.guid = {56A8E372-991D-4DCA-B91D-93D775974CF5} ?>
<?define COPYING.guid = {B7801DBA-1C49-4BF4-91AD-33C65F5C7895} ?>
<?define mercurial.rc.guid = {1D5FAEEE-7E6E-43B1-9F7F-802714316B15} ?>
<?define mergetools.rc.guid = {E8A1DC29-FF40-4B5F-BD12-80B9F7BF0CCD} ?>
<?define paths.rc.guid = {F9ADF21D-5F0B-4934-8CD9-14BE63664721} ?>
<?define cacert.pem.guid = {EC1B2630-FE21-46E6-915B-A6545AF703D4} ?>
<?define ProgramMenuDir.guid = {D5A63320-1238-489B-B68B-CF053E9577CA} ?>
</Include>