Automating configure choices based on what is installed considered harmful

Don't automatically --disable-odk (if not mentioned explicitly either
way) based on whether doxygen is found or not.

Caolán says: It's an absolute pain as a maintainer when packages do
that. You build it in some minimal build env and all is well, then
some depend changes and something else ends up in the build env and
now your package fails to build anymore, or behaves quite differently.

Change-Id: I8bc6ab6f90e6e070a37e37b5108081425e116173
Reviewed-on: https://gerrit.libreoffice.org/19324
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>
diff --git a/configure.ac b/configure.ac
index 9e0be41..062d5d33 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7335,11 +7335,7 @@ else
        if test "$with_doxygen" = yes; then
            AC_PATH_PROG([DOXYGEN], [doxygen])
            if test -z "$DOXYGEN"; then
                if test "$enable_odk" = "" ; then
                    enable_odk="no"
                else
                    AC_MSG_ERROR([doxygen not found in \$PATH; specify its pathname via --with-doxygen=..., or disable its use via --without-doxygen])
                fi
                AC_MSG_ERROR([doxygen not found in \$PATH; specify its pathname via --with-doxygen=..., or disable its use via --without-doxygen])
            fi
        else
            AC_MSG_CHECKING([for doxygen])