useorocos: fixed verbose debug output if VERBOSE environment variable is set

Signed-off-by: Johannes Meyer <johannes@intermodalics.eu>
useorocos: fixed a cmake error that caused duplicate package_LIBRARIES entries if orocos_find_package(package) has been called more than once

Signed-off-by: Johannes Meyer <johannes@intermodalics.eu>
package: added pkg-config build and run dependency to package.xml

Signed-off-by: Johannes Meyer <johannes@intermodalics.eu>