Remove _CRT_SECURE_NO_WARNINGS from testArchUtil

[nvmkuruc]

Description of Change(s)

_CRT_SECURE_NO_WARNINGS is defined in two places on Windows.

OpenUSD/pxr/base/arch/testenv/testArchUtil.cpp

Line 7 in a32790e

#define _CRT_SECURE_NO_WARNINGS

OpenUSD/cmake/defaults/msvcdefaults.cmake

Line 88 in a32790e

_add_define("_CRT_SECURE_NO_WARNINGS")

This yields the following warning when building testArchUtil.

testArchUtil.cpp(7): warning C4005: '_CRT_SECURE_NO_WARNINGS': macro redefinition
testArchUtil.cpp: note: see previous definition of '_CRT_SECURE_NO_WARNINGS'

This PR removes the unneeded _CRT_SECURE_NO_WARNINGS. It's not clear what warning _CRT_SECURE_NO_WARNINGS was being introduced to suppress in testArchUtil as disabling both the #define and msvcdefaults.cmake doesn't yield any additional warnings in testArchUtil.

Link to proposal (if applicable)

Fixes Issue(s)

Checklist

• I have created this PR based on the dev branch

• I have followed the coding conventions

• I have added unit tests that exercise this functionality (Reference:
  testing guidelines)

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement (Reference:
  Contributor License Agreement instructions)

[jesschimein]

Filed as internal issue #USD-11620

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