archivers/py-borgbackup: use fixed xxhash instead of avoiding it

This reverts commit 9db903a89b because
it does not fix the situation for lack of a PORTREVISION bump.
Let us use the opportunity to fix the real bug instead.

Now with xxhash fixed as of 0.8.1_2, drop 9db903a89, and
bump PORTREVISION so we flush out the old garbage packages.

A simple web search would have brought up that static_assert() is
a C11 convenience macro defined in <assert.h>, and a detailed
search would have turned up that this had been fixed in xxhash
before.

While here, add a smoke test to post-install.

Proper fix was
Reported by:	Thierry Dussuet <thierry.dussuet@protonmail.com>
PR:		265060
MFH:		2022Q3

(cherry picked from commit 714af13781)

archivers/py-borgbackup/Makefile

@@ -14,7 +14,8 @@ LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}setuptools_scm>=1.7:devel/py-setuptools_scm@${PY_FLAVOR}
 LIB_DEPENDS=	liblz4.so:archivers/liblz4 \
-		libzstd.so:archivers/zstd
+		libzstd.so:archivers/zstd \
+		libxxhash.so:devel/xxhash
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}packaging>=19.0:devel/py-packaging@${PY_FLAVOR}
 
 USES=		python:3.5+ ssl

archivers/py-borgbackup/files/patch-setup.py

@@ -1,11 +0,0 @@
---- setup.py.orig	2022-07-16 16:20:52 UTC
-+++ setup.py
-@@ -23,7 +23,7 @@ prefer_system_libzstd = True
- prefer_system_libb2 = True
- 
- # True: use the shared libxxhash (>= 0.6.5 [>= 0.7.2 on ARM]) from the system, False: use the bundled xxhash code
--prefer_system_libxxhash = True
-+prefer_system_libxxhash = False
- 
- # prefer_system_msgpack is another option, but you need to set it in src/borg/helpers.py.
-