Fix str-bytes issue

--- a/distutils.ext/obidistutils/command/build_scripts.py

+++ b/distutils.ext/obidistutils/command/build_scripts.py

@@ -43,7 +43,7 @@ class build_scripts(ori_build_scripts):

             # that way, we'll get accurate feedback if we can read the

             # script.

             try:

-                f = open(script, "r")

+                f = open(script, "rb")

             except IOError:

                 if not self.dry_run:

                     raise

@@ -67,11 +67,11 @@ class build_scripts(ori_build_scripts):

                 log.info("copying and adjusting %s -> %s", script,

                          self.build_dir)

                 if not self.dry_run:

-                    outf = open(outfile, "w")

+                    outf = open(outfile, "wb")

                     if not sysconfig.python_build:

-                        outf.write("#!%s%s\n" %

+                        outf.write(("#!%s%s\n" %

                                    (self.executable,

-                                    post_interp))

+                                    post_interp)).encode())

                     else:

                         outf.write("#!%s%s\n" %

                                    (os.path.join(

@@ -93,8 +93,8 @@ class build_scripts(ori_build_scripts):

                 if self.dry_run:

                     log.info("changing mode of %s", F)