[profiler example] Add missing "err.h" include in "profiler.h" #1848
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Several profiler_v*.h files uses ncclResult_t defined in err.h but the header is not #included-ed in "profiler.h"
Currently the .c files in example does include it before including "profiler.h" and therefore does not trigger compilation error. But this commit should make the "profiler.h" header self-contained (as it was in previous versions).