Fix build for CMake >= 3.27

[scivision]

CMake >= 3.27 warns if cmake_minimum_required(VERSION ) is less than 3.5.

CMake for Lapack was already using CMake 3.6 features.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (ae2f14f) 0.00% compared to head (bd4bfaf) 0.00%.

❗ Current head bd4bfaf differs from pull request most recent head 0a52d71. Consider uploading reports for the commit 0a52d71 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #910   +/-   ##
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  Coverage    0.00%    0.00%           
=======================================
  Files        1918     1918           
  Lines      188614   188614           
=======================================
  Misses     188614   188614           

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[weslleyspereira]

I like the change. The CMake build system in LAPACK may actually be using functionality from more recent versions of CMake anyway.

[ACSimon33]

@weslleyspereira We need at least CMake 3.6 since we are using list(FILTER ..):

https://cmake.org/cmake/help/latest/command/list.html#filter

So maybe it makes sense to set the minimum version to 3.6