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Fix a build failure when upgrading zeroconf from 0.28.8 to 0.38.1:

https://issues.guix.gnu.org/53247

Patch copied from Gentoo:

https://bugs.gentoo.org/800233#c5

diff --color -Naru a/src/calibre/devices/smart_device_app/driver.py b/src/calibre/devices/smart_device_app/driver.py
--- a/src/calibre/devices/smart_device_app/driver.py	2021-08-08 08:32:03.104016444 +0200
+++ b/src/calibre/devices/smart_device_app/driver.py	2021-08-08 08:33:30.699018403 +0200
@@ -2040,13 +2040,6 @@
 # Function to monkeypatch zeroconf to remove the 15 character name length restriction.
 # Copied from https://github.com/jstasiak/python-zeroconf version 0.28.1
 
-
-from zeroconf import (BadTypeInNameException, _HAS_A_TO_Z,
-                      _HAS_ONLY_A_TO_Z_NUM_HYPHEN_UNDERSCORE,
-                      _HAS_ASCII_CONTROL_CHARS,
-                      _HAS_ONLY_A_TO_Z_NUM_HYPHEN)
-
-
 def service_type_name(type_: str, *, allow_underscores: bool = False) -> str:
     """
     Validate a fully qualified service name, instance or subtype. [rfc6763]
@@ -2087,6 +2080,12 @@
     :param type_: Type, SubType or service name to validate
     :return: fully qualified service name (eg: _http._tcp.local.)
     """
+
+    from zeroconf import (BadTypeInNameException, _HAS_A_TO_Z,
+                      _HAS_ONLY_A_TO_Z_NUM_HYPHEN_UNDERSCORE,
+                      _HAS_ASCII_CONTROL_CHARS,
+                      _HAS_ONLY_A_TO_Z_NUM_HYPHEN)
+
     if not (type_.endswith('._tcp.local.') or type_.endswith('._udp.local.')):
         raise BadTypeInNameException("Type '%s' must end with '._tcp.local.' or '._udp.local.'" % type_)