tests: add another variation of EADDRNOTAVAIL message (e.g. from NetBSD)

tests/common-pattern.py

@@ -158,6 +158,7 substitutions = [
     br'$EADDRNOTAVAIL$': (
         # strerror()
         br'Cannot assign requested address',
+        br'Can\'t assign requested address',
         # FormatMessage(WSAEADDRNOTAVAIL)
     ),
 }