[gnu_linux_x86] Changes to allow various libraries to work on gnu_linux_x86.
[gnu_linux_x86] Outputs logcat messages to console.
[gnu_linux_x86] Comment out some codes due to lacking of gettid on GNULinux.
[gnu_linux_x86] Don't include log_read.c.
Merge branch 'gnu_linux_x86' of https://github.com/DroidSim/platform_system_core into gnu_linux_x86

Conflicts:
	libbacktrace/Android.build.mk
	libbacktrace/Android.mk
	liblog/logd_write.c
	libutils/Android.mk