Permit the '@' character in filenames

This will allow for systemd template units to be stored in files/
without mangling the filename.

Signed-off-by: Mike Gilbert <floppym@gentoo.org>

src/pkgcheck/checks/pkgdir.py

@@ -17,7 +17,7 @@
 allowed_filename_chars.update(chr(x) for x in range(ord("a"), ord("z") + 1))
 allowed_filename_chars.update(chr(x) for x in range(ord("A"), ord("Z") + 1))
 allowed_filename_chars.update(chr(x) for x in range(ord("0"), ord("9") + 1))
-allowed_filename_chars.update([".", "-", "_", "+", ":"])
+allowed_filename_chars.update([".", "-", "_", "+", ":", "@"])
 
 
 class MismatchedPN(results.PackageResult, results.Error):