Unwanted output to stdout

[josenobile]

I got this in STDOUT:
VIPS-INFO: 8 point mask
VIPS-INFO: reducev sequential line cache
VIPS-INFO: 7 point mask
Can it be removed?

[lovell]

Cross-posted at lovell/sharp#1144 - @josenobile please don't do this.

[jalamprea]

This problem could be fixed with a simple Sharp update. I already sent the update on this PR #7