6989505: java.awt.Robot's getPixelColor treats not fully opaque Window as fully transparent.
Summary: Use ::CreateDC() instead of ::GetDC()
Reviewed-by: art, dcherepanov
os_family = linux
arch = x86
arch_model = x86_64
os_arch = linux_x86
os_arch_model = linux_x86_64
lib_arch = amd64
compiler = gcc
sysdefs = -DLINUX -D_GNU_SOURCE -DAMD64