GitLab

Benchmarks: Build Pipeline - Support rocblas building in rocm4.0_ubuntu18.04_py3.6_pytorch_1.7.0 docker (#172)

**Description**
Revise rocblas building logic in third_party/makefile to support rocblas building in rocm4.0_ubuntu18.04_py3.6_pytorch_1.7.0 docker.

**Major Revision**
- add extra building logic including env about pthread limit and build command restrict to reduce amount of resource used

**Minor Revision**
- make rocm_version to be able to modify