Merge topic 'find-blas-lapack-cleanup'

635f2c87f5 FindBLAS: Fix EML and ArmPL indentations
816dc1cb19 FindBLAS: Replace set(A val) with string(APPEND)
a7843faa20 FindLAPACK: Replace set(A val) with string(APPEND)

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6605