Fix #2645, fix warning error in evs_ut

[avan989]

Fix #2645, fix warning error in evs_ut when running in rtems

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• [x] I reviewed the Contributing Guide.
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Describe the contribution A clear and concise description of what the contribution is.

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Testing performed Steps taken to test the contribution:

1. Make ENABLE_UNIT_TESTS=true SIMULATION=native install
2. Run evs test.

Expected behavior changes A clear and concise description of how this contribution will change behavior and level of impact.

• API Change: xxx (if applicable)
• Behavior Change: xxx (if applicable)
• Or no impact to behavior

System(s) tested on

• Hardware: [e.g. PC, SP0, MCP750]
• OS: [e.g. Ubuntu 18.04, RTEMS 4.11, VxWorks 6.9]
• Versions: [e.g. cFE 6.6, OSAL 4.2, PSP 1.3 for mcp750, any related apps or tools]

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