K 10
svn:author
V 4
ache
K 8
svn:date
V 27
2012-10-12T13:17:19.773510Z
K 7
svn:log
V 329
MFC r241137,r241154

Using putenv() and later direct pointer contents modification it is possibe
to craft environment variables with similar names like that:
a=1
a=2
...
unsetenv("a") should remove them all to make later getenv("a") impossible.
Fix it to do so (this is GNU autoconf test #3 failure too).

PR:             172273

END