Fix seam build, particularly jsr250.jar and symlinkage

mvn-jpp install:install-file -DgroupId=sun-jaxws -DartifactId=jsr250-api -Dversion=2.1.3 -Dpackaging=jar -Dfile=$(build-classpath jboss-ejb-api/jsr250-api)

The jboss-ejb-api/jsr250-api part is wrong as this file doesn't exist.

Later we have

#replace all jars which can be get from REQUIRES packages
pushd %

/lib
...
ln -sf %{_javadir}/sun-jaxws/jsr250-api.jar jsr250-api.jar
...

which doesn't match the above. But all of these %{_javadir}/sun-jaxws links should point to the real external locations.