Fix CMake (< v3.20) warning

[justsmth]

Description of changes:

• Use file instead of configure_file for copying scripts.
  • Fixes warning output when using older CMake versions.

Callouts

• The FILE_PERMISSIONS option for configure_file is only available after v3.20. Older CMake versions produce the following warning:

CMake Warning (dev) at tool-openssl/CMakeLists.txt:50 (configure_file):
  configure_file called with unknown argument(s):

   FILE_PERMISSIONS
   OWNER_READ
   OWNER_WRITE
   OWNER_EXECUTE
   GROUP_READ
   GROUP_EXECUTE
   WORLD_READ
   WORLD_EXECUTE

This warning is for project developers.  Use -Wno-dev to suppress it.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.76%. Comparing base (a47a334) to head (f7920b4).
⚠️ Report is 578 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2345      +/-   ##
==========================================
- Coverage   78.77%   78.76%   -0.01%     
==========================================
  Files         620      620              
  Lines      107954   107954              
  Branches    15336    15334       -2     
==========================================
- Hits        85036    85033       -3     
- Misses      22262    22263       +1     
- Partials      656      658       +2     

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