#1563: cmake: enable MPI guards by default regardless of build

[lifflander]

Fixes #1563

[nmm0]

lgtm!

[github-actions]

Pipelines results

PR tests (gcc-7, ubuntu, mpich, trace runtime, LB)

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PR tests (gcc-5, ubuntu, mpich)

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PR tests (gcc-9, ubuntu, mpich, zoltan)

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PR tests (clang-5.0, ubuntu, mpich)

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PR tests (gcc-6, ubuntu, mpich)

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PR tests (gcc-10, ubuntu, openmpi, no LB)

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PR tests (clang-9, ubuntu, mpich)

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PR tests (gcc-8, ubuntu, mpich, address sanitizer)

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PR tests (clang-13, alpine, mpich)

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PR tests (clang-11, ubuntu, mpich)

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PR tests (gcc-11, ubuntu, mpich)

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PR tests (clang-13, ubuntu, mpich)

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PR tests (nvidia cuda 10.1, ubuntu, mpich)

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PR tests (nvidia cuda 11.0, ubuntu, mpich)

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PR tests (clang-12, ubuntu, mpich)

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PR tests (clang-14, ubuntu, mpich)

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PR tests (intel icpx, ubuntu, mpich)

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PR tests (gcc-12, ubuntu, mpich)

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PR tests (clang-10, ubuntu, mpich)

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PR tests (intel icpc, ubuntu, mpich)

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[codecov]

Codecov Report

Merging #1866 (30a0e5d) into develop (9f48ecd) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1866      +/-   ##
===========================================
+ Coverage    84.34%   84.37%   +0.02%     
===========================================
  Files          760      760              
  Lines        26791    26791              
===========================================
+ Hits         22598    22606       +8     
+ Misses        4193     4185       -8     

Impacted Files	Coverage Δ
.../vt/vrt/collection/balance/lb_invoke/lb_manager.cc	80.05% <0.00%> (-0.28%)	⬇️
src/vt/vrt/collection/manager.impl.h	96.44% <0.00%> (+0.99%)	⬆️
src/vt/phase/phase_manager.cc	94.11% <0.00%> (+1.68%)	⬆️