Log Message:
Introduce several changes so that package builds successfully on
alpha--netbsd1.6.2:
1) Rename the baseline_symbols.txt files that define abi and implement
   logic in Makefile that uses these according to architecture and
   NetBSD version (1.x versus 2.x)
2) Add several patches that allow code to compile on alpha--netbsd1.6.2
3) Revise Makefile so that libiconv is found under NetBSD 1.6.2