This reverts commit 0a944b345e, reversing
changes made to 61733ed6cc.
I dislike these massive stdenv changes with unclear motivation,
especially when they involve gratuitous mass renames like NIX_CC ->
NIX_BINUTILS. The previous such rename (NIX_GCC -> NIX_CC) caused
months of pain, so let's not do that again.
(cherry picked from commit ec8d41f08c)
The main thing is that I'm convinced the license can't be free when it
restricts redistribution to certain platforms. That probably holds with
the usual definitions like from Debian, FSF or OSI.
(cherry picked from commit 8414d8386b)
