gnu: python-pyqt: Update to 5.14.2.

* gnu/packages/qt.scm (python-pyqt): Update to 5.14.2.
[source](uri): Add PyPI mirror.
[source](patches): Remove obsolete.
* gnu/packages/patches/pyqt-unbundled-qt.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.

gnu/local.mk

@@ -1395,7 +1395,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/pygpgme-disable-problematic-tests.patch  \
   %D%/packages/patches/pyqt-configure.patch			\
   %D%/packages/patches/pyqt-public-sip.patch			\
-  %D%/packages/patches/pyqt-unbundled-qt.patch			\
   %D%/packages/patches/python-2-deterministic-build-info.patch	\
   %D%/packages/patches/python-2.7-adjust-tests.patch		\
   %D%/packages/patches/python-2.7-search-paths.patch		\

gnu/packages/patches/pyqt-unbundled-qt.patch

@@ -1,19 +0,0 @@
-Remove test for bundled Qt which breaks dependent applications.  This has
-been fixed in 5.13.
-
-Taken from Arch Linux:
-https://git.archlinux.org/svntogit/packages.git/tree/trunk/python2-pyqt5-crash-fix.patch?h=packages/pyqt5&id=3e56e11d1fd7b1eac8242ce64c58db2bd9acba20
-
-diff -ur PyQt5_gpl-5.12.3/qpy/QtCore/qpycore_post_init.cpp.in PyQt5_gpl-5.12.3b/qpy/QtCore/qpycore_post_init.cpp.in
---- PyQt5_gpl-5.12.3/qpy/QtCore/qpycore_post_init.cpp.in        2019-06-25 14:41:02.000000000 +0200
-+++ PyQt5_gpl-5.12.3b/qpy/QtCore/qpycore_post_init.cpp.in       2019-07-01 17:06:34.882644535 +0200
-@@ -151,8 +151,4 @@
-     // initialised first (at least for Windows) and this is the only way to
-     // guarantee things are done in the right order.
-     PyQtSlotProxy::mutex = new QMutex(QMutex::Recursive);
--
--    // Load the embedded qt.conf file if there is a bundled copy of Qt.
--    if (!qpycore_qt_conf())
--        Py_FatalError("PyQt5.QtCore: Unable to embed qt.conf");
- }
-

gnu/packages/qt.scm

@@ -1945,18 +1945,21 @@ module provides support functions to the automatically generated code.")
 (define-public python-pyqt
   (package
     (name "python-pyqt")
-    (version "5.12.3")
+    (version "5.14.2")
     (source
       (origin
         (method url-fetch)
-        (uri (string-append "https://www.riverbankcomputing.com/static/"
-                            "Downloads/PyQt5/" version "/PyQt5_gpl-"
-                            version ".tar.gz"))
+        ;; PyPI is the canonical distribution point of PyQt.  Older
+        ;; releases are available from the web site.
+        (uri (list (pypi-uri "PyQt5" version)
+                   (string-append "https://www.riverbankcomputing.com/static/"
+                                  "Downloads/PyQt5/" version "/PyQt5-"
+                                  version ".tar.gz")))
+        (file-name (string-append "PyQt5-"version ".tar.gz"))
         (sha256
          (base32
-          "041155bdzp57jy747p5d59740c55yy3241cy1x2lgcdsvqvzmc0d"))
+          "1c4y4qi1l540gd125ikj0al00k5pg65kmqaixcfbzslrsrphq8xx"))
        (patches (search-patches "pyqt-configure.patch"
-                                "pyqt-unbundled-qt.patch"
                                 "pyqt-public-sip.patch"))))
     (build-system gnu-build-system)
     (native-inputs