Windows %BUILD_TARGET% changed in Tor Browser 6.0

In previous Tor Browser releases, the %BUILD_TARGET% used in the updater URL in Windows versions was WINNT_x86-gcc3. In Tor Browser 6.0, this changed to WINNT_x86-gcc3-x64, which broke our updater URLs.

A quick fix was to apply this patch, and regenerate the .htacess we use to deliver the update manifests:

diff --git a/tools/update-responses/config.yml b/tools/update-responses/config.yml
index 5e4d463f9262..4595544ec21e 100644
--- a/tools/update-responses/config.yml
+++ b/tools/update-responses/config.yml
@@ -5,7 +5,7 @@ download:
 build_targets:
     linux32: Linux_x86-gcc3
     linux64: Linux_x86_64-gcc3
-    win32: WINNT_x86-gcc3
+    win32: WINNT_x86-gcc3(-x64)?
     osx32: Darwin_x86-gcc3
     osx64: Darwin_x86_64-gcc3
 channels:

However this change breaks the check_update_responses_deployement command, which uses the build_targets values in test URLs (without expecting them to be regexps), so other changes are required to fix that part.

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