PA-RISC assembler pack: switch to bve in 64-bit builds.

PR: 3074
(cherry picked from commit 02450ec69dda7815ba1e7bd74eb30f0ae1eb3042)
config: fix executable format detection on latest FreeBSD.

Submitted by: Bryan Drewery
PR: 3075
(cherry picked from commit c256e69d3f3acd0794ae9c1f353f4093bd4c8878)