Add format specifiers to various format ids so we can print thread ids in decimal on Linux and FreeBSD.

CC: emaste

Differential Revision: http://llvm-reviews.chandlerc.com/D1234

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187425 91177308-0d34-0410-b5e6-96231b3b80d8