krb5 commit: Make docs build python3-compatible

https://github.com/krb5/krb5/commit/a7c6d98480f1e33454173f88381921472d72f80a
commit a7c6d98480f1e33454173f88381921472d72f80a
Author: Robbie Harwood <[email protected]>
Date:   Wed Jun 13 15:07:48 2018 -0400

    Make docs build python3-compatible
    
    python3 removed execfile(), which we use for loading version data and
    paths information in docs.  Call exec() directly instead.
    
    ticket: 8692 (new)

 doc/conf.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/conf.py b/doc/conf.py
index 25ba214..0555808 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -50,7 +50,7 @@ copyright = u'1985-2018, MIT'
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
-execfile("version.py")
+exec(open("version.py").read())
 # The short X.Y version.
 r_list = [r_major, r_minor]
 if r_patch:
@@ -238,7 +238,7 @@ if 'mansubs' in tags:
     ckeytab = '``@CKTNAME@``'
 elif 'pathsubs' in tags:
     # Read configured paths from a file produced by the build system.
-    execfile('paths.py')
+    exec(open("paths.py").read())
 else:
     bindir = ':ref:`BINDIR <paths>`'
     sbindir = ':ref:`SBINDIR <paths>`'