helgrind/tests/tc17_sembar.c: Remove bool typedef

helgrind/tests/tc17_sembar.c: Remove bool typedef

Since C23 bool is a keyword. Also bool wasn't actually used.

tc17_sembar.c:45:14: error: both 'long' and '_Bool' in declaration specifiers
   45 | typedef long bool;
      |              ^~~~
tc17_sembar.c:45:1: warning: useless type name in empty declaration
   45 | typedef long bool;
      | ^~~~~~~

(cherry picked from commit 932bf2c027579c8d933b57ed80bb5842b390bdb3)