Run save_compatibility_test in the autotools build.

[iphydf]

This change is 

[codecov]

Codecov Report

Merging #1125 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master   #1125     +/-   ##
========================================
- Coverage    82.5%   82.4%   -0.2%     
========================================
  Files          80      80             
  Lines       14342   14345      +3     
========================================
- Hits        11840   11823     -17     
- Misses       2502    2522     +20

Impacted Files	Coverage Δ
auto_tests/save_compatibility_test.c	88.8% <100%> (+0.5%)	⬆️
toxcore/crypto_core_test.cc	90.3% <0%> (-9.7%)	⬇️
toxav/toxav.c	67.5% <0%> (-1.7%)	⬇️
toxav/msi.c	64.2% <0%> (-1.4%)	⬇️
toxcore/Messenger.c	85.7% <0%> (-0.2%)	⬇️

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