Revert "fix export macro name in comment"

This reverts commit 886705869cdafd9098d7f5ff75fff7c80ba02515.

Change-Id: Iee502c2795a2a0510c8f6cefc42b352e0c7791ac
Merge topic 'SIMPLEITK-450_BreakUpLabelStatistics' into next

de79955 Revert "fix export macro name in comment"