Support for building PAPI via a submodule (#41)

* Enable building PAPI via submodule

* Miscellaneous fixes

- Use TIMEMORY_PAPI_ARRAY_SIZE in backtrace
- remove pthread_gotcha init from fork_gotcha::configure
- fix HSA OnLoad called during before tooling init

* PAPI array size + PAPI.cmake updates

- updated timemory submodule with PAPI updates
- fix for backtrace _hw_cnt_labels

* Disable OMPT for focal

* format

examples/openmp/CMakeLists.txt

@@ -12,8 +12,9 @@ add_executable(openmp-lu ${CMAKE_CURRENT_SOURCE_DIR}/LU/lu.cpp
                          $<TARGET_OBJECTS:openmp-common>)
 
 find_program(CLANGXX_EXECUTABLE NAMES clang++)
-find_library(LIBOMP_LIBRARY
-             NAMES omp ${CMAKE_SHARED_LIBRARY_PREFIX}omp${CMAKE_SHARED_LIBRARY_SUFFIX}.5)
+find_library(
+    LIBOMP_LIBRARY
+    NAMES omp omp5 ${CMAKE_SHARED_LIBRARY_PREFIX}omp${CMAKE_SHARED_LIBRARY_SUFFIX}.5)
 if(CLANGXX_EXECUTABLE AND LIBOMP_LIBRARY)
     target_compile_options(openmp-common PUBLIC -W -Wall -fopenmp=libomp)
     target_compile_options(openmp-cg PRIVATE -W -Wall -fopenmp=libomp)