Snippets for vips 8.18.3 from Fedora ppc64le

Sourced from https://kojipkgs.fedoraproject.org/packages/vips/8.18.3/4.fc46/data/logs/ppc64le/build.log.

• ../libvips/iofuncs/generate.c:281:21: warning: variable ‘nany’ set but not used [-Wunused-but-set-variable=]
    281 |         int i, len, nany;
        |                     ^~~~