concurrent_map_mt_gdb tests don't work on clang

[igchor]

ISSUE: concurrent_map_mt_gdb tests don't work on clang

Environment Information

• libpmemobj-cpp version(s):

• PMDK (libpmemobj) package version(s):

• OS(es) version(s): arch

• kernel version(s):

• compiler, libraries, packaging and other related tools version(s):

• clang version: 10.0.1

• gdb version: 10.1

Please provide a reproduction of the bug:

Run concurrent_mt_gdb tests

How often bug is revealed:

always

Actual behavior:

Test timeouts due to not hitting a breakpoint - rbreak does not seem to work.

Expected behavior:

Test passes

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)

[igchor]

#967

[karczex]

Disable those tests for clang