gnome-panel: rebuild with latest libgnome-desktop-3.17

Further upgrade blocked by requirement for libsystemd.

gnome/gnome-panel/Portfile

@@ -4,7 +4,9 @@ PortSystem          1.0
 PortGroup           gobject_introspection 1.0
 
 name                gnome-panel
+# update to version 3.28.0+ requires libsystemd
 version             3.26.0
+revision            1
 set branch          [join [lrange [split ${version} .] 0 1] .]
 maintainers         {devans @dbevans} openmaintainer
 categories          gnome
@@ -20,7 +22,8 @@ master_sites        gnome:sources/${name}/${branch}/
 use_xz              yes
 
 checksums           rmd160  9d46c59616d5c675fed6ee210418e05b5e9d4275 \
-                    sha256  ada88f8c7c55ab5f8b1879efe9276c45abedf5db9c317c1a3616877f6ed76271
+                    sha256  ada88f8c7c55ab5f8b1879efe9276c45abedf5db9c317c1a3616877f6ed76271 \
+                    size    2966884
 
 depends_build       port:pkgconfig \
                     port:itstool \