Add OpenMP in codelets

CMakeLists.txt

compute/CMakeLists.txt

compute/zpotrf.c

include/chameleon/config.h.in

include/chameleon/runtime_struct.h

runtime/CMakeLists.txt

runtime/openmp/CMakeLists.txt

runtime/openmp/codelets/codelet_zasum.c

runtime/openmp/codelets/codelet_zaxpy.c

runtime/openmp/codelets/codelet_zbuild.c

runtime/openmp/codelets/codelet_zgeadd.c

runtime/openmp/codelets/codelet_zgelqt.c

runtime/openmp/codelets/codelet_zgemm.c

runtime/openmp/codelets/codelet_zgeqrt.c

runtime/openmp/codelets/codelet_zgessm.c

runtime/openmp/codelets/codelet_zgessq.c

runtime/openmp/codelets/codelet_zgetrf.c

runtime/openmp/codelets/codelet_zgetrf_incpiv.c

runtime/openmp/codelets/codelet_zgetrf_nopiv.c

runtime/openmp/codelets/codelet_zhe2ge.c