jabsorb FTBFS because of missing build dependency on libservlet2.5-java and libcommons-httpclient-java

Hi,

As stated in Debian bug #521942, jabsorb is missing a build dependency on libservlet2.5-java and libcommons-httpclient-java, and therefore FTBFS:
compile:
    [mkdir] Created dir: /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/build/classes
    [javac] Compiling 65 source files to /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/build/classes
    [javac] ----------
    [javac] 1. ERROR in /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/src/org/jabsorb/JSONRPCServlet.java (at line 37)
    [javac] import javax.servlet.ServletConfig;
    [javac] ^^^^^^^^^^^^^
    [javac] The import javax.servlet cannot be resolved
    [javac] ----------
    [javac] 2. ERROR in /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/src/org/jabsorb/JSONRPCServlet.java (at line 38)
    [javac] import javax.servlet.ServletException;
    [javac] ^^^^^^^^^^^^^
    [javac] The import javax.servlet cannot be resolved
    [javac] ----------
    [javac] 3. ERROR in /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/src/org/jabsorb/JSONRPCServlet.java (at line 39)
    [javac] import javax.servlet.http.HttpServlet;
    [javac] ^^^^^^^^^^^^^
    [javac] The import javax.servlet cannot be resolved
    [javac] ----------
    [javac] 4. ERROR in /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/src/org/jabsorb/JSONRPCServlet.java (at line 40)
    [javac] import javax.servlet.http.HttpServletRequest;
    [javac] ^^^^^^^^^^^^^
    [javac] The import javax.servlet cannot be resolved
    [javac] ----------
    [javac] 5. ERROR in /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/src/org/jabsorb/JSONRPCServlet.java (at line 41)
    [javac] import javax.servlet.http.HttpServletResponse;
    [javac] ^^^^^^^^^^^^^
    [javac] The import javax.servlet cannot be resolved
    [javac] ----------
    [javac] 6. ERROR in /build/fabrice-jabsorb_1.3-1-amd64-5H1cPt/jabsorb-1.3-1/src/org/jabsorb/JSONRPCServlet.java (at line 42)
    [javac] import javax.servlet.http.HttpSession;
    [javac] ^^^^^^^^^^^^^
    [javac] The import javax.servlet cannot be resolved
...