Add the directory containing the executables to a file in /etc/paths.d.

Do for executables what we do for man pages.

Change-Id: I066f0199fd6064cae21e6ad079a1f344e1002c66
Reviewed-on: https://code.wireshark.org/review/18205
Reviewed-by: Guy Harris <guy@alum.mit.edu>

packaging/macosx/Scripts/wireshark-postinstall.sh

@@ -19,6 +19,13 @@ do
 	rm -f "$PLUGINS_PATH"/$plugin.so "$PLUGINS_PATH"/$plugin.la
 done
 
+# Setting PATH
+# if /etc/paths.d/Wireshark already exists we overwrite it.
+#
+WSPATH="$2/Wireshark.app/Contents/MacOS"
+
+echo $WSPATH > /etc/paths.d/Wireshark
+
 # Setting MANPATH
 # if /etc/manpaths.d/Wireshark already exists we overwrite it.
 #