fix(sync): make vix_warnings and sanitizers private #9

Job	Run time
Standalone Package Export Check	32s
Static Analysis	43s
Runtime Smoke Checks	26s
Valgrind Checks	24s
Configuration Coverage	25s
Sanitized Build and Tests (gcc, utils=OFF, net=OFF, json=OFF)	34s
Sanitized Build and Tests (clang, utils=OFF, net=OFF, json=OFF)	32s
Sync Strict CI Summary	0s
	3m 36s

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