archivers/py-borgbackup: avoid dependency on xxhash port

- Instead, use the xxhash library provided in the same port

PR:	265060
Author:	Jose G. Juanino <jjuanino@gmail.com>

archivers/py-borgbackup/Makefile

@@ -12,8 +12,7 @@ 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 \
-		libxxhash.so:devel/xxhash
+		libzstd.so:archivers/zstd
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}packaging>=19.0:devel/py-packaging@${PY_FLAVOR}
 
 USES=		python:3.5+ ssl

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

@@ -0,0 +1,11 @@
+--- 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.
+