gnu: python-irc-parser-tests: Fix tests.

* gnu/packages/irc.scm (python-irc-parser-tests)[arguments]
<test-backend>: Use 'custom.
<test-flags>: Provide "test.py".
[native-inputs]: Remove python-wheel.

Change-Id: I3128b29d0e485c0dea2109bc9a13026322ec02da

gnu/packages/irc.scm

@@ -886,10 +886,14 @@ performance when matching IRC hostmasks.")
        (sha256
         (base32 "0x0psq31f43d88b8jhaqwd9f1ykiqm4j13i8nxgcgkgp992cw002"))))
     (build-system pyproject-build-system)
+    (arguments
+     (list #:test-backend #~'custom
+           #:test-flags #~(list "test.py")))
     (propagated-inputs (list python-pyyaml))
     (native-inputs
-     (list python-girc python-ircmatch
-           python-setuptools python-wheel))
+     (list python-girc
+           python-ircmatch
+           python-setuptools))
     (home-page "https://github.com/ircdocs/parser-tests")
     (synopsis "Tests for various IRC protocol parsers")
     (description