test: cond_var_posix_0_helgrind fails

[igchor]

ISSUE: cond_var_posix_0_helgrind

Environment Information

• libpmemobj-cpp version(s):
• PMDK (libpmemobj) package version(s):
• OS(es) version(s):
• kernel version(s):
• compiler, libraries, packaging and other related tools version(s):

and possibly:

• TBB version(s):
• ndctl version(s):

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libpmemobj-cpp.html

https://bugzilla.opensuse.org/show_bug.cgi?id=1162365

How often bug is revealed:

(always, often, rare)

Actual behavior:

Expected behavior:

Details

Additional information about Priority and Help Requested:

Are you willing to submit a pull request with a proposed change? (Yes, No)

Requested priority: (Showstopper, High, Medium, Low)

[lukaszstolarczuk]

Probably connected: #113