reduce: prefer use of `VIPS_FABS()` #1447

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pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

fontconfig 2.15.0 is already installed and up-to-date. To reinstall 2.15.0, run: brew reinstall fontconfig

glib 2.82.2 is already installed and up-to-date. To reinstall 2.82.2, run: brew reinstall glib

libtiff 4.7.0 is already installed and up-to-date. To reinstall 4.7.0, run: brew reinstall libtiff

little-cms2 2.16 is already installed and up-to-date. To reinstall 2.16, run: brew reinstall little-cms2