exiftool: drop 10.16, add 10.18 with "make test" in TEST().

media-libs/exiftool/exiftool-10.18.recipe

@@ -9,7 +9,7 @@ LICENSE="GNU GPL v1
 	Artistic"
 REVISION="1"
 SOURCE_URI="http://www.sno.phy.queensu.ca/~phil/exiftool/Image-ExifTool-$portVersion.tar.gz"
-CHECKSUM_SHA256="d9e8f91c6e9b3a5a1d1274491c5be38272ced7b58f7305ea21fd18f8ef3da596"
+CHECKSUM_SHA256="114db22e39afc864845f240d9d99326b203c87da9d3d5e53a03523de0e272ad3"
 SOURCE_DIR="Image-ExifTool-$portVersion"
 
 ARCHITECTURES="any"
@@ -41,3 +41,8 @@ INSTALL()
 {
 	make install
 }
+
+TEST()
+{
+	make test
+}