While looking at #16838 I found at least two cases of sed patching in
depends that now seems to be redundant. There's possibly a third case,
but I haven't looked into that enough yet.

Patching 0 -> kCGMouseButtonLeft should not be required, as
kCGMouseButtonLeft has been used in the cocoa/qcocoacursor.mm source for
a while.

The include we were modifying in
src/plugins/platforms/xcb/qxcbxsettings.cpp was removed in this commit.