suggestion of backtrace in phobos

[shinichiro.h]

> http://shinh.skr.jp/tmp/backtrace.zip
> http://shinh.skr.jp/tmp/phobos.patch

Ahh I missed the release 0.177. I've put the new version of backtrace
phobos. But there seems to be something strange on Windows.

http://shinh.skr.jp/tmp/backtrace0_177.zip

You can check with the following command:

% dmd.exe signal_test.d -L/Map -g -debug
% ./signal_test.exe
Error: Access Violation
Backtrace:
00402019 void signal_test.func()
00402028 __Dmain
0040211f _main
004107c9 _mainCRTStartup
7ee7eede ???
b7ed9567 ???