Drop patch previously backported: root-doxygen-endof-part1.patch
Drop patch accepted upstream: root-python2-compat.patch
Add back line accidentally removed in root-config
Install headers in new PyROOT with COMPONENT headers
Increase test timeout for ppc64le
Do not export Python modules in CMake config
Drop patch root-clang-ignore-gcc-options.patch
("Recent ROOT does not send all possible compiler flags to rootcling.")