[gnu_linux_x86] Initial commit.

1. Added remote "DroidSim" (https://github.com/DroidSim/).
2. Points platform/build and platform/system/core to DroidSim.
Typo.
[gnu_linux_x86] Correct name to DroidSim.
[gnu_linux_x86] Points libunwind to DroidSim.
[gnu_linux_x86] Points external/llvm to DroidSim.
[gnu_linux_x86] Points external/protobuf to DroidSim.
[gnu_linux_x86] Includes device_generic_gnu_linux_x86.
[gnu_linux_x86] Corrects remote for device_generic_gnu_linux_x86.
[gnu_linux_x86] Points frameworks/compile/libbcc to DroidSim.
[gnu_linux_x86] Points frameworks/native to DroidSim.
[gnu_linux_x86] Points frameworks/rs to DroidSim.
[gnu_linux_x86] Points hardware/libhardware to DroidSim.
[gnu_linux_x86] Fixed broken frameworks/av.
[gnu_linux_x86] Points art to DroidSim.
[gnu_linux_x86] typo.
[gnu_linux_x86] Correct art path.

Change-Id: I6f90002753f7f5f94cc3f4071a35c395bd614b00
[gnu_linux_x86] Remove revision for art.
[gnu_linux_x86] Pointer dalvik to DroidSim.