Replace USE_PYTHON* by USES=python.

This commit consists of area51's r10314 and r10356 patchsets.

Approved by:	rakuco (mentor)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370100 35697150-7ecd-e111-bb59-0022644237b5
Allow installing contrib modules in a different prefix than /usr/local

PR:		194160
Submitted by:	jhujhiti@adjectivism.org


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370101 35697150-7ecd-e111-bb59-0022644237b5
mail/rainloop: Rework to avoid unnecessary overriding do-extracts target

There's no reason to roll-your-own extraction target, the stock target
works fine.  Remove and and adjust do-install accordingly; there's not
change the pkg-plist.

While here, remove RVER derivative of PORTVERSION.  This looked wrong to
me -- I doubt the RVER will end in ".164" after the PORTVERSION is
incremented.  If anything, the PORTVERSION would be derivative of RVER,
but for now I just have two seprately defined variables.  Also, unmask
installation commands.


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370102 35697150-7ecd-e111-bb59-0022644237b5
- Add USES=libtool and INSTALL_TARGET=install-strip
- Remove pthread patching


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370103 35697150-7ecd-e111-bb59-0022644237b5
Add USES=libtool and INSTALL_TARGET=install-strip


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370104 35697150-7ecd-e111-bb59-0022644237b5
- Add USES=libtool and INSTALL_TARGET=install-strip
- Remove pthread patching


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370105 35697150-7ecd-e111-bb59-0022644237b5