Log Message:
1) Revised ABI specification (baseline_symbols.txt) to go with release 3.4.1
2) Added include statment for zlib/buildlink3.mk to Makefile to go with
   CONFIGURE_ARGS+=--with-system-zlib already there. Thank you
   Georg Schwarz <geos@epost.de> for pointing out this ommision.
3) Incorporated logic from gcc3 that determines whether to add
   binutils dependency or not.
4) Eliminated hardcoded target of netbsdelf2.0 as a step toward supporting
   other architectures.