Remove npmlog as a direct dependency

It remains a transitive dependency via prebuild-install

lib/libvips.js

@@ -37,6 +37,14 @@ const cachePath = function () {
   return libvipsCachePath;
 };
 
+const log = function (item) {
+  if (item instanceof Error) {
+    console.error(`sharp: ${item.message}`);
+  } else {
+    console.log(`sharp: ${item}`);
+  }
+};
+
 const isRosetta = function () {
   /* istanbul ignore next */
   if (process.platform === 'darwin' && process.arch === 'x64') {
@@ -104,6 +112,7 @@ module.exports = {
   minimumLibvipsVersion,
   minimumLibvipsVersionLabelled,
   cachePath,
+  log,
   globalLibvipsVersion,
   hasVendoredLibvips,
   pkgConfigPath,