Optimize install_openmpi.sh script

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Reminder

• Have you linked an issue with this pull request?
• Have you added adequate unit tests and/or case tests for your pull request?
• Have you noticed possible changes of behavior below or in the linked issue?
• Have you explained the changes of codes in core modules of ESolver, HSolver, ElecState, Hamilt, Operator or Psi? (ignore if not applicable)

Linked Issue

Fix #...

Unit Tests and/or Case Tests for my changes

• A unit test is added for each new feature or bug fix.

What's changed?

When using the toolchain_gnu.sh script to download the required math libraries for ABACUS on the Huawei Kunpeng platform, I encountered the error: "Configure: error: Could not compile an MPI Fortran program." According to ChatGPT, the reason is that on the Kunpeng platform, OpenMPI automatically disables Fortran support without reporting an explicit error. I resolved this issue by modifying the install_openmpi.sh script. Therefore, I submit this PR to make the toolchain more adaptable to different environments.

Any changes of core modules? (ignore if not applicable)

• Example: I have added a new virtual function in the esolver base class in order to ...