GCC 13 is unhappy about mixing enums and ints. However, if we fix the
type un mmtty's _mm_log() prototype, the compiler will find something
else to be irritiated about:
[1/2] Compiling C object test/mmtty.p/mmtty.c.o
../test/mmtty.c: In function ‘_mm_log’:
../test/mmtty.c:283:5: warning: enumeration value ‘MM_LOG_LEVEL_MSG’ not handled in switch [-Wswitch-enum]
283 | switch (level) {
| ^~~~~~
[2/2] Linking target test/mmtty
Fix that first.
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