gnu: Pin some packages to python-cython-0.

* gnu/packages/audio.scm (python-pyliblo):
  [native-inputs]: Remove python-cython; add python-cython-0.
* gnu/packages/bioinformatics.scm (python-pysam): Likewise.
* gnu/packages/parallel.scm (openpmix): Likewise.
* gnu/packages/python-science.scm (python-scipy): Likewise.

Change-Id: I7a02d39b7d7cbb8a40ab4434bfe90d4e944433d3

gnu/packages/audio.scm

@@ -3592,7 +3592,7 @@ player-like clients.")
     (build-system pyproject-build-system)
     (arguments `(#:tests? #f)) ;no tests
     (native-inputs
-     (list python-cython python-setuptools python-wheel))
+     (list python-cython-0 python-setuptools python-wheel))
     (inputs
      (list liblo))
     (home-page "https://das.nasophon.de/pyliblo/")

gnu/packages/bioinformatics.scm

@@ -6084,7 +6084,7 @@ subgroups.")
     (inputs
      (list ncurses curl zlib))
     (native-inputs
-     (list python-cython
+     (list python-cython-0
            python-pytest
            python-setuptools
            python-wheel

gnu/packages/parallel.scm

@@ -727,7 +727,7 @@ single-instruction multiple-data (SIMD) intrinsics.")
                 (("#define PMIX_CONFIGURE_CLI .*")
                  "#define PMIX_CONFIGURE_CLI \"[scrubbed]\"\n")))))))
     (inputs (list libevent `(,hwloc "lib") zlib))
-    (native-inputs (list perl python python-cython))
+    (native-inputs (list perl python python-cython-0))
     (synopsis "PMIx library")
     (description
      "PMIx is an application programming interface standard that provides

gnu/packages/python-science.scm

@@ -3157,7 +3157,7 @@ cross-validation.")
            meson-python
            pkg-config
            python-click
-           python-cython-0.29.35
+           python-cython-0
            python-doit
            python-hypothesis
            python-pooch