[patch] SYS_gettid

[Yao Qi]

This patch does two things
  1) include <sys/syscall.h> in which SYS_gettid is defined, otherwise
helper_thread_id has no change to set, and in-proc-agent will go to
endless loop (in tracepoint.c:gdb_ust_init).
  2) remove preprocessor conditional.  If SYS_gettid is not defined,
compiler can emit an error, which is better than leaving
helper_thread_id unset and get an error at runtime.

With this patch, program doesn't hang there at start up.  OK for mainline?

-- 
Yao (齐尧)
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