database/pyspatialite: Modernize before setuptools update

Modernize in preparation for a pending setuptools update which
identified this port as failing during an exp-run [1].

• Use canonical CHEESESHOP master site
• Use autoplist & concurrent
• Remove pkg-plist accordingly
• Remove PYDISTUTILS_PKGNAME and WRKSRC overrides
• Stop package from adding empty directory to --record (and therefore pkg-plist) output

While I'm here:

• Add LICENSE and LICENSE_FILE
• Strip shared library
• Re-patch patches according to makepatch
• Remove spurious whitespace

[1] https://reviews.freebsd.org/D2704

Approved by: python, portmgr (exp-run)