mktemp was used to create temp-files but it is not POSIX and
the version shipped for Windows has known bugs.
Replace mktemp with atomic directory and file creation using mkdir
and mv, both of which are atomic.
The temporary directory "session" directory is created using mkdir
with a 32bit random number for the name.
eg: /tmp/easyrsa-temp/b01dface
The temporary file is created by moving another file into the place
of the temp-file, with a 32bit random number for the name.
eg: /tmp/easyrsa-temp/b01dface/c01dface
Signed-off-by: Richard T Bonhomme <tincantech@protonmail.com>
368db7fc5c