waf: Fix python3 issues.

- Found after updating to FreeBSD-12.0 which defaults to Python3.

posix-compliance/posix_rst.py

@@ -142,7 +142,7 @@ class compliance:
         self.data = None
 
     def load(self, name):
-        with open(name, 'rb') as f:
+        with open(name, 'r') as f:
             data = csv.reader(f, delimiter = ',', quotechar = '"')
             hdr = None
             rows = []

wscript

@@ -7,6 +7,13 @@ import os.path
 
 import waflib
 
+#
+# Set Python's system path to `common` from the top level so the
+# conf.py modules in subdirectories can be found. See xml_catalogue in
+# common/waf.py.
+#
+sys.path.append(os.path.abspath('common'))
+
 from common import waf as docs_waf
 from common import version
 
@@ -15,13 +22,6 @@ from common import version
 #
 rtems_major_version = '5'
 
-#
-# Set Python's system path to `common` from the top level so the
-# conf.py modules in subdirectories can be found. See xml_catalogue in
-# common/waf.py.
-#
-sys.path.append(os.path.abspath('common'))
-
 #
 # The documents to build.
 #