2036114 (pass TMPDIR to external programs) patch

[Lukáš Jirkovský]

Hello,
I'm back with a fresh new patch. This time it's patch for bug
#2036114. I had to make some changes into makefile generation, but it
seems that the makefile containing TMPDIR is correctly generated.

But I've some problems with it. First, I don't know how to test it.
The other one is that I don't know if setting TMPDIR in makefile
actually do something, because this would work only when variable set
in makefile is used the same way as environment variables are in
shell. So can this work, or do I've to pass TMPDIR to all executed
programs?

Patch is attached.

Regards,
Lukáš "stativ" Jirkovský