build.xml: check all components for modifications

componentsUpToDate in task "init-components" only considered
ant-opencms.jar. The uptodate check should be performed against all jars
under jars-components.
build.xml: add "com/**" classes to opencms.jar

Classes under "com" package were missing since langdetect-opencms was
moved back to the src tree in commit
9c524bab0a6d0c39cc041d6679f5074bfd1c617b