wix: always normalize version string

Before, it was possible to pass in a custom version string
which would not be valid in MSI. So we always normalize the
version string.

While we're here, also print when we normalize the version string,
for better visibility.

Differential Revision: https://phab.mercurial-scm.org/D8004

contrib/packaging/hgpackaging/wix.py

@@ -411,8 +411,11 b' def build_installer('
         extra_packages_script=extra_packages_script,
     )
 
-    version = version or normalize_version(find_version(source_dir))
+    orig_version = version or find_version(source_dir)
+    version = normalize_version(orig_version)
     print('using version string: %s' % version)
+    if version != orig_version:
+        print('(normalized from: %s)' % orig_version)
 
     if post_build_fn:
         post_build_fn(source_dir, hg_build_dir, dist_dir, version)