The --url command line option does not dowload all paths

Summary

When using --url some paths are not redirected:

download: https://sourceware.org/bugzilla/attachment.cgi?id=14783&format=raw -> patches/gdb-14067-python-config.diff

Use:

../source-builder/sb-set-builder --log=ppc-6-ppc.txt --prefix=/opt/rtems/6 --url=https://ftp.rtems.org/pub/rtems/cache/rsb/main 6/rtems-powerpc