Update to 34.0.1847.45 (current beta)
Fix 'make patch' and resync 'make makepatch'
Extend ignore pattern, this is handy when working with multiple branches.
Manually fix line numbers in extra-patch-*
Update REINPLACE_CMD commands.

The "is_linux" -> "is_linux or is_bsd" changes are all upstreamed except
for xtb_reader_unittest.py for which I failed to see the point.