Revert "devdraw: control+click = button 2, alt/shift+click = button 3"

This reverts commit 347ba14158f962944320d2e9d6cfe6f979ac1e9f.

Conflicts:
	src/cmd/devdraw/x11-itrans.c
Revert "devdraw: disable XCopyArea optimization"

This reverts commit 61059a9f8c5b7a6d1a83db3a0751cf49ca7aa988.

Conflicts:
	src/cmd/devdraw/x11-draw.c