Rebuild Binutils 2.38 using all modern features

- Rather than using part-by-part build of Binutils, use autogen and full
  ./configure, make build.
- Enable some other modern features, including the gold linker, threaded
  linking and 64-bit linking.
- This allows GCC 12 to build unhindered by binutils.

sysc/run2.sh

@@ -74,7 +74,7 @@ build texinfo-6.7
 
 build gcc-4.7.4
 
-build binutils-2.38
+build binutils-2.38 pass1.sh
 
 build gperf-3.1
 
@@ -122,6 +122,8 @@ build python-3.11.1
 
 build gcc-10.4.0
 
+build binutils-2.38 pass2.sh
+
 if [ "$FORCE_TIMESTAMPS" = True ] ; then
     echo 'Forcing all files timestamps to be 0 unix time.'
     canonicalise_all_files_timestamp