Switch to ld.bfd --version

`ld --version` prints
`Ubuntu LLD 18.1.3 (compatible with GNU linkers)`
but we want to see glibc version.

Author: vitalybuka

zorg/buildbot/builders/sanitizers/buildbot_functions.sh

@@ -57,7 +57,7 @@ echo @@@BUILD_STEP Info@@@
   echo
   uname -a
   echo
-  ld --version
+  ld.bfd --version
   echo
   uptime
   echo