package/pkg-python: fix PKG_PYTHON_FIXUP_SYSCONFIGDATA

package/pkg-python: fix PKG_PYTHON_FIXUP_SYSCONFIGDATA

Find used by PKG_PYTHON_FIXUP_SYSCONFIGDATA can fail if directories
are not present. This failure is silently ignored because find is
on the LHS of a pipe.

This commit fixes the find failure. HOST_DIR is used as the starting
point and the search is filtered on the expected directories.

This commit also adds -print0 and the $(Q) verbosity flag as minor
changes.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
[yann.morin.1998@free.fr:
  - split long line with the two -path options
  - move "| xargs ..." onto its own line
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>