gcc-cross-wrapper: Explicitly add LD program name.

This is because autoconf is passing -print-prog-name=ld to the
cross-gcc, which in turn assumes a FHS compliant filesystem hierarchy
and searches ../../../../$crossConfig/bin/ld for the correct ld.

Of course, this won't work on Nix, hence we're explicitly passing the
correct LD program name.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/build-support/gcc-cross-wrapper/setup-hook.sh

@@ -70,6 +70,8 @@ fi
 
 if test "$dontSetConfigureCross" != "1"; then
     configureFlags="$configureFlags --build=$system --host=$crossConfig"
+    # This is because -print-prog-name tries to search FHS paths.
+    configureFlags="$configureFlags LD=$crossConfig-ld"
 fi
 # Disabling the tests when cross compiling, as usually the tests are meant for
 # native compilations.