mimalloc builds are not deterministic due to using DATE and TIME

[MichalPetryka]

mimalloc/src/options.c

Lines 210 to 222 in 3099bed

	_mi_message("v%i.%i.%i%s%s (built on %s, %s)\n", vermajor, verminor, verpatch,
	#if defined(MI_CMAKE_BUILD_TYPE)
	", " mi_stringify(MI_CMAKE_BUILD_TYPE)
	#else
	""
	#endif
	,
	#if defined(MI_GIT_DESCRIBE)
	", git " mi_stringify(MI_GIT_DESCRIBE)
	#else
	""
	#endif
	, __DATE__, __TIME__);

The logging here breaks build determinism due to using date and time.
This causes builds that static link mimalloc to not be deterministic.

[daanx]

Ah yes -- but it is so convenient :-) I like deterministic builds though so let's remove it.