openblas is hard-coded in the CMake modules

[njzjz]

Describe the bug

abacus-develop/docs/quick_start/easy_install.md

Lines 16 to 17 in e2322fa

	- [BLAS](http://www.netlib.org/blas/). You can use [OpenBLAS](https://www.openblas.net/).
	- [LAPACK](http://www.netlib.org/lapack/).

The documentation says any BLAS and LAPACK is allowed, and even gives a link to the reference BLAS and LAPACK.

However, openblas is hard coded in the CMake files:

abacus-develop/cmake/FindLAPACK.cmake

Line 9 in e2322fa

NAMES openblas

making the reference blas cannot be found (conda-forge/abacus-feedstock#13) before the patch.

Expected behavior

Any BLAS can be found by CMake.

To Reproduce

See conda-forge/abacus-feedstock#13

Environment

See conda-forge/abacus-feedstock#13

Additional Context

The workaround is to entirely delete FindLAPACK.cmake (njzjz@d81bc98) so CMake's native FindLAPACK is used.

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