Proper libthread_db support in gdbserver.

Change-Id: I5ebbb18efe663e7bf24d6147f33cc92f38dea148
Fix signal handling
Fix missing files checking in gdbserver-7.1.x
Remove gdb-6.6/bfd/doc/bfd.info
Add gdb-7.3
Fix gdb-7.3 for android
Allow gdbserver 7.3 to bind to a Unix-domain socket using '+' prefix.

Original source of patch:
commit 29acfe8be7f87bfb2b12bb8155d15e576531dbf0
Author: David 'Digit' Turner <digit@android.com>
Date:   Sat Apr 17 00:17:13 2010 -0700
Fix building of Leopard binaries on SnowLeopard/Lion hosts
Enable TUI in windows build
Merge branch 'crystax-r7' of private.git.crystax.net:android/toolchain/gdb into crystax-r7
Release gdb-7.3.x source for Android toolchain.

Notice that gdbserver-7.3.x has not been tested.

Change-Id: Ib8167290398346676bcef1d79aee336ca5f3ee2c
Add Linaro GDB 7.3 2011.12 (gdb-7.3)
Merge branch 'linaro-gdb' into crystax-r7
Patch GDB 6.6 and 7.1.x to understand linux-android

Per request of review in https://android-review.googlesource.com/#/c/36453/
Related CL: https://android-review.googlesource.com/#/c/36421/

Change-Id: Ia9dfead6d234f664b780d7bb78cb72d604823cdc
Fix gdb 7.3.x build on Windows

..which doesn't have syslog.h

Change-Id: I0d8d06026385976187599f5a89ffdf104fc14e8a
Rename gdb-7.3 to gdb-7.4
Update gdb-7.4 to Linaro GDB 7.4-2012.06
Merge branch 'linaro-gdb' into crystax-r7-new-gdb
Fix x86 build of gdb-7.4
Merge branch 'master' into crystax-r8