Update package libqt5-qtdoc from 5.12.7 to 5.15.2 (jsc#SLE-19540)

- Add patch to fix possible crash caused by GCC 11 build fix:
  * 0001-Partially-revert-813a928c7c3cf98670b6043149880ed5c95.patch
- Add patches to fix build with GCC 11 (boo#1181861, QTBUG-90395):
  * 0001-Fix-build-with-GCC-11-include-limits.patch
  * 0002-Build-fixes-for-GCC-11.patch

- Update to 5.15.2:
    http://code.qt.io/cgit/qt/qt.git/plain/dist/changes-5.15.2/?h=5.15.2

- Update to 5.15.1:
  * New bugfix release
  * For more details please see:
    http://code.qt.io/cgit/qt/qt.git/plain/dist/changes-5.15.1/?h=5.15.1
- Drop patches, now upstream:
  * qtdeclarative-switch-to-python3.patch

- In _constraints set default min 10GB disk space for all arches

- Update to version 5.15.0:
  * No changelog available

- Update to version 5.15.0-rc2:
  * No changelog available

- Add _constraints for PowerPC because need more than 8GB disk
  (bsc#1154344).

- Update to 5.15.0-rc:
  * New bugfix release
  * For the changes between 5.14.2 and 5.15.0 please see:

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