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

PR: 3074
(cherry picked from commit 02450ec69dda7815ba1e7bd74eb30f0ae1eb3042)
aesni-sha256-x86_64.pl: fix typo in Windows SEH.
(cherry picked from commit 42386fdb62176ed3af237dd3e802ba9b8c0d4def)
x86_64-xlate.pl: Windows fixes.
(cherry picked from commit a9d14832fd98cb0c13b53fddea39765fb259358c)
bn/bn_exp.c: Solaris-specific fix, T4 MONTMUL relies on alloca.
(cherry picked from commit b74ce8d9489b319c0d097ff116b5a0bdb634462d)