Remove DEPENDS from add_custom_command as CMake made the behavior clear

[andrewhop]

Description of changes:

Instead of silently ignoring the parameter CMake now prints a warning and lets the command continue to work:

CMake Warning (dev) at crypto/CMakeLists.txt:654 (add_custom_command):
  The following keywords are not supported when using
  add_custom_command(TARGET): DEPENDS.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.

https://cmake.org/cmake/help/latest/policy/CMP0175.html

Testing:

Built locally after deleting the option and didn't see the error message.

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 78.98%. Comparing base (41060fe) to head (170a73d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2178   +/-   ##
=======================================
  Coverage   78.98%   78.98%           
=======================================
  Files         611      611           
  Lines      105878   105878           
  Branches    14984    14984           
=======================================
  Hits        83633    83633           
- Misses      21588    21592    +4     
+ Partials      657      653    -4     

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