agent.sh: Changed "declare" to "export" when declaring $PREFIX

This is needed so the other scripts can use the PREFIX variable.

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Signed-off-by: Josiney de Souza <josineys@c3sl.ufpr.br>

agent.sh

@@ -109,7 +109,7 @@ function elapsedTime()
     return $?
 }
 
-declare PREFIX="$(dirname $(readlink -f $0))"
+export PREFIX="$(dirname $(readlink -f $0))"
 source ${PREFIX}/load-config.sh || exit 3
 source ${PREFIX}/client/common.sh