simpleperf: fix scripts on windows.

1. Fix handling windows path like C:\xxx.
2. Fix adding windows executable suffix.
3. Fix one indent error in annotate.py.
4. Collect libwinpthread-1.dll in update.py.
5. simpleperf.exe on windows x86_64 doesn't work, replace it
   with simpleperf.exe on windows x86.

Bug: http://b/37788631
Test: run demo examples on windows.
Change-Id: I7195881149e70f1af9a60efc41e65fe301c62984
6 files changed