Revert "Show reasons for regenerating the ninja file"

This reverts commit 027cf0aa484b7602f4a653d1e6e287ce02d3d44a.

Reason for revert: It may need more discussion about set the flag by default, revert it first.

Change-Id: I42f9a449b69b54ce5d906e12c7f611107e219894
1 file changed