tests/testutils/site.py: Check for bwrap supporting --json-status-fd

tests/testutils/site.py

@@ -4,7 +4,7 @@
 import os
 import sys
 
-from buildstream import utils, ProgramNotFoundError
+from buildstream import _site, utils, ProgramNotFoundError
 
 try:
     utils.get_host_tool('bzr')
@@ -33,8 +33,10 @@ except (ImportError, ValueError):
 try:
     utils.get_host_tool('bwrap')
     HAVE_BWRAP = True
+    HAVE_BWRAP_JSON_STATUS = _site.get_bwrap_version() >= (0, 3, 2)
 except ProgramNotFoundError:
     HAVE_BWRAP = False
+    HAVE_BWRAP_JSON_STATUS = False
 
 try:
     utils.get_host_tool('lzip')