gnu: python-magic: Work around crash on .crx files.

* gnu/packages/patches/python-magic-python-bytecode.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/python-xyz.scm (python-magic)[source](patches): Add it.
[inputs]: Add FILE-NEXT.
[arguments]: While at it, remove input labels.
* gnu/packages/diffoscope.scm (diffoscope)[native-inputs]: Add FILE-NEXT.

gnu/packages/patches/python-magic-python-bytecode.patch

@@ -0,0 +1,19 @@
+File 5.41 changed the MIME type of Python bytecode; adjust accordingly.
+
+Taken from upstream:
+
+  https://github.com/ahupp/python-magic/commit/0ae7e7ceac0e80e03adc75c858bb378c0427331a
+
+diff --git a/test/test.py b/test/test.py
+index 0c4621c..e443b84 100755
+--- a/test/test.py
++++ b/test/test.py
+@@ -90,7 +90,7 @@ def test_mime_types(self):
+         try:
+             m = magic.Magic(mime=True)
+             self.assert_values(m, {
+-                'magic._pyc_': ('application/octet-stream', 'text/x-bytecode.python'),
++                'magic._pyc_': ('application/octet-stream', 'text/x-bytecode.python', 'application/x-bytecode.python'),
+                 'test.pdf': 'application/pdf',
+                 'test.gz': ('application/gzip', 'application/x-gzip'),
+                 'test.snappy.parquet': 'application/octet-stream',