sprintf deprecated

[sdarwin]

"Use snprintf if available as some compilers (clang 14.0) issue deprecation warnings for sprintf"

libs/gil/include/boost/gil/extension/io/tiff/detail/log.hpp:        sprintf(buf, fmt, ap);
libs/gil/include/boost/gil/extension/io/tiff/detail/log.hpp:        sprintf(buf, fmt, ap);