stdenv-linux: Ensure binutils comes before bootstrapTools in $PATH

Otherwise, when building glibc and other packages, the "strip" from
bootstrapTools is used, which doesn't recognise some tags produced by
the newer "ld" from binutils.

pkgs/build-support/cc-wrapper/setup-hook.sh

···
 
 # Note: these come *after* $out in the PATH (see setup.sh).
 
-if [ -n "@cc@" ]; then
-    addToSearchPath PATH @cc@/bin
+if [ -n "@binutils@" ]; then
+    addToSearchPath _PATH @binutils@/bin
 fi
 
-if [ -n "@binutils@" ]; then
-    addToSearchPath PATH @binutils@/bin
+if [ -n "@cc@" ]; then
+    addToSearchPath _PATH @cc@/bin
 fi
 
 if [ -n "@libc@" ]; then
-    addToSearchPath PATH @libc@/bin
+    addToSearchPath _PATH @libc@/bin
 fi
 
 if [ -n "@coreutils@" ]; then
-    addToSearchPath PATH @coreutils@/bin
+    addToSearchPath _PATH @coreutils@/bin
 fi
 
 if [ -z "$crossConfig" ]; then

pkgs/stdenv/generic/setup.sh

···
 for i in $initialPath; do
     if [ "$i" = / ]; then i=; fi
     addToSearchPath PATH $i/bin
-    addToSearchPath PATH $i/sbin
 done
 
 if [ "$NIX_DEBUG" = 1 ]; then
···
         source "$pkg"
     fi
 
+    if [ -d $1/bin ]; then
+        addToSearchPath _PATH $1/bin
+    fi
+
     if [ -f "$pkg/nix-support/setup-hook" ]; then
         source "$pkg/nix-support/setup-hook"
     fi
···
 _addToNativeEnv() {
     local pkg=$1
 
-    if [ -d $1/bin ]; then
-        addToSearchPath _PATH $1/bin
-    fi
-
     # Run the package-specific hooks set by the setup-hook scripts.
     runHook envHook "$pkg"
 }
···
 
 _addToCrossEnv() {
     local pkg=$1
-
-    # Some programs put important build scripts (freetype-config and similar)
-    # into their crossDrv bin path. Intentionally these should go after
-    # the nativePkgs in PATH.
-    if [ -d $1/bin ]; then
-        addToSearchPath _PATH $1/bin
-    fi
 
     # Run the package-specific hooks set by the setup-hook scripts.
     runHook crossEnvHook "$pkg"