[PATCH] build: eliminate use of python execfile command

[David Bremner]

As discussed in
id:8cc9dd580ad672527e12f43706f9803b2c8e99d8.1405220724.git.wking at tremily.us,
execfile is unavailable in python3.

The approach of this commit avoids modifying the python module path,
which is arguably preferable since it avoids potentially accidentally importing a module from the wrong place.
---
 devel/release-checks.sh | 2 +-
 doc/prerst2man.py       | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/devel/release-checks.sh b/devel/release-checks.sh
index 797d62a..ae02f55 100755
--- a/devel/release-checks.sh
+++ b/devel/release-checks.sh
@@ -130,7 +130,7 @@ else
 fi
 
 echo -n "Checking that python bindings version is $VERSION... "
-py_version=`python -c "execfile('$PV_FILE'); print __VERSION__"`
+py_version=`python -c "with open('$PV_FILE') as vf: exec(vf.read()); print __VERSION__"`
 if [ "$py_version" = "$VERSION" ]
 then
 	echo Yes.
diff --git a/doc/prerst2man.py b/doc/prerst2man.py
index 437dea9..968722a 100644
--- a/doc/prerst2man.py
+++ b/doc/prerst2man.py
@@ -10,7 +10,8 @@ outdir = argv[2]
 if not isdir(outdir):
     makedirs(outdir, 0o755)
 
-execfile(sourcedir + "/conf.py")
+with open(sourcedir + "/conf.py") as cf:
+    exec(cf.read())
 
 
 def header(file, startdocname, command, description, authors, section):
-- 
2.1.3