stdenv: drop remove unnecessary env var

and the associated obsolete functions

support for log nesting was removed in 2017 https://github.com/nixos/nixpkgs/commit/6669a3b47711dc967df0ea8ff93fa9857aad015d

pkgs/development/tools/misc/automake/automake-1.11.x.nix

···
   nativeBuildInputs = [ perl autoconf ];
   buildInputs = [ autoconf ];
 
-  # Disable indented log output from Make, otherwise "make.test" will
-  # fail.
-  preCheck = "unset NIX_INDENT_MAKE";
   doCheck = false; # takes _a lot_ of time, fails 11 of 782 tests
 
   # Don't fixup "#! /bin/sh" in Libtool, otherwise it will use the

pkgs/development/tools/misc/automake/automake-1.15.x.nix

···
 
   patches = [ ./help2man-SOURCE_DATE_EPOCH-support.patch ];
 
-  # Disable indented log output from Make, otherwise "make.test" will
-  # fail.
-  preCheck = "unset NIX_INDENT_MAKE";
   doCheck = false; # takes _a lot_ of time, fails 3 out of 2698 tests, all seem to be related to paths
   doInstallCheck = false; # runs the same thing, fails the same tests
 

pkgs/development/tools/misc/automake/automake-1.16.x.nix

···
 
   setupHook = ./setup-hook.sh;
 
-  # Disable indented log output from Make, otherwise "make.test" will
-  # fail.
-  preCheck = "unset NIX_INDENT_MAKE";
   doCheck = false; # takes _a lot_ of time, fails 3 out of 2698 tests, all seem to be related to paths
   doInstallCheck = false; # runs the same thing, fails the same tests
 

pkgs/stdenv/generic/setup.sh

···
 ######################################################################
 # Logging.
 
-# Obsolete.
-stopNest() { true; }
-header() { echo "$1"; }
-closeNest() { true; }
-
 # Prints a command such that all word splits are unambiguous. We need
 # to split the command in three parts because the middle format string
 # will be, and must be, repeated for each argument. The first argument
···
 unset _XDG_DATA_DIRS
 
 
-# Make GNU Make produce nested output.
-export NIX_INDENT_MAKE=1
-
-
 # Normalize the NIX_BUILD_CORES variable. The value might be 0, which
 # means that we're supposed to try and auto-detect the number of
 # available CPU cores at run-time.
···
 
 unpackFile() {
     curSrc="$1"
-    header "unpacking source archive $curSrc" 3
+    echo "unpacking source archive $curSrc"
     if ! runOneHook unpackCmd "$curSrc"; then
         echo "do not know how to unpack source archive $curSrc"
         exit 1
···
     fi
 
     for i in "${patchesArray[@]}"; do
-        header "applying patch $i" 3
+        echo "applying patch $i"
         local uncompress=cat
         case "$i" in
             *.gz)
···
 showPhaseHeader() {
     local phase="$1"
     case "$phase" in
-        unpackPhase) header "unpacking sources";;
-        patchPhase) header "patching sources";;
-        configurePhase) header "configuring";;
-        buildPhase) header "building";;
-        checkPhase) header "running tests";;
-        installPhase) header "installing";;
-        fixupPhase) header "post-installation fixup";;
-        installCheckPhase) header "running install tests";;
-        *) header "$phase";;
+        unpackPhase) echo "unpacking sources";;
+        patchPhase) echo "patching sources";;
+        configurePhase) echo "configuring";;
+        buildPhase) echo "building";;
+        checkPhase) echo "running tests";;
+        installPhase) echo "installing";;
+        fixupPhase) echo "post-installation fixup";;
+        installCheckPhase) echo "running install tests";;
+        *) echo "$phase";;
     esac
 }
 

pkgs/tools/package-management/nix/nix-perl.nix

···
   ];
 
   preConfigure = "export NIX_STATE_DIR=$TMPDIR";
-
-  preBuild = "unset NIX_INDENT_MAKE";
 }