Build bbreak - port amd64 - netbsd-6 branch

[Paul Goyette <paul%whooppee.com@localhost>]

Running a 'build.sh release' on the netbsd-6 branch, I'm getting the 
following error message:

#      link  npfctl/npfctl
/build/netbsd-6/tools/x86_64/amd64/bin/x86_64--netbsd-gcc    
--sysroot=/build/netbsd-6/dest/amd64     -o npfctl  npfctl.o npf_var.o 
npf_data.o npf_ncgen.o npf_build.o npf_extmod.o npf_disassemble.o npf_scan.o 
npf_parse.o -lnpf -lprop -lcrypto -lutil -ly       
-Wl,-dynamic-linker=/libexec/ld.elf_so -Wl,-rpath,/lib  -L=/lib
/lib/libcrypt.so.1: undefined reference to `__explicit_bzero'
collect2: ld returned 1 exit status
*** [npfctl] Error code 1


(Also reported to riz@ for release management in private Email)



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