hgreviewboard: fix the json import

Newer Python versions include a json module, but hgreviewboard tries to use
the simplejson module included in its tarball.
We don't install the included simplejson module, so fix the import line.

Reviewed by:	bapt

devel/hgreviewboard/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	hgreviewboard
 PORTVERSION=	1.0
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	https://bitbucket.org/ccaughie/hgreviewboard/get/
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -21,6 +22,10 @@ USE_PYTHON=	yes
 
 NO_BUILD=	yes
 
+post-patch:
+	${SED} -i '' -e 's/import simplejson/import json as simplejson/' \
+		${WRKSRC}/reviewboard.py
+
 do-install:
 	${MKDIR} ${STAGEDIR}${PYTHON_SITELIBDIR}/reviewboard
 	${INSTALL_DATA} ${WRKSRC}/__init__.py \