Kill vestiages of DEFAULT_TMPDIR

It was removed long ago in cf403b50.
Thanks for @rwbarton for catching this.

Updates nofib submodule.

Test Plan: Validate

Reviewers: austin, rwbarton

Subscribers: thomie, rwbarton

Differential Revision: https://phabricator.haskell.org/D2493

GHC Trac Issues: #12443

docs/users_guide/separate_compilation.rst

@@ -405,10 +405,6 @@ Redirecting temporary files
     name of the directory where temporary files should be put. GCC and other
     programs will honour the :envvar:`TMPDIR` variable as well.
 
-    Even better idea: Set the :envvar:`DEFAULT_TMPDIR` :command:`make` variable when
-    building GHC, and never worry about :envvar:`TMPDIR` again. (see the build
-    documentation).
-
 .. _hi-options:
 
 Other options related to interface files

mk/config.mk.in

@@ -396,21 +396,6 @@ GhcRtsWithLibdw=$(strip $(if $(filter $(TargetArch_CPP),i386 x86_64),@UseLibdw@,
 #
 ################################################################################
 
-# Directory used by GHC (and possibly other tools) for storing
-# temporary files.  If your TMPDIR isn't big enough, either override
-# this in build.mk or set your environment variable "TMPDIR" to point
-# to somewhere with more space.  (TMPDIR=. is a good choice).
-
-# DEFAULT_TMPDIR isn't called TMPDIR because GNU make tends to
-# override an environment variable with the value of the make variable
-# of the same name (if it exists) when executing sub-processes, so
-# setting the TMPDIR env var would have no effect in the build tree.
-
-DEFAULT_TMPDIR		= /tmp
-ifeq "$(TARGETPLATFORM)" "i386-unknown-mingw32"
-DEFAULT_TMPDIR		= /C/TEMP
-endif
-
 BIN_DIST_NAME         = ghc-$(ProjectVersion)
 BIN_DIST_PREP_DIR     = bindistprep/$(BIN_DIST_NAME)
 BIN_DIST_PREP_TAR     = bindistprep/$(BIN_DIST_NAME)-$(TARGETPLATFORM).tar

nofib @ bed591d4

-Subproject commit 6dc2b467c71cf7c7e8f99ba4e60ca4b32a90236a
+Subproject commit bed591d4aa45c7b92a40985c72bc6b3daaa68f0d