SF patch #460805 by Chris Gonnerman: Support for unsetenv()
This adds unsetenv to posix, and uses it in the __delitem__ method of
os.environ.
(XXX Should we change the preferred name for putenv to setenv, for
consistency?)
diff --git a/configure.in b/configure.in
index a578527..96ba400 100644
--- a/configure.in
+++ b/configure.in
@@ -1411,7 +1411,7 @@
setlocale setregid setreuid setsid setpgid setuid setvbuf snprintf \
sigaction siginterrupt sigrelse strftime strptime symlink sysconf \
tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
- truncate uname waitpid _getpty getpriority)
+ truncate uname unsetenv waitpid _getpty getpriority)
# check for openpty and forkpty