deps: update asm Makefile for openssl-1.0.2a

This includes following changes,
 - Updated asm files for each platforms which are required in
 openssl-1.0.2a.
 - Some perl files need CC and ASM envs. Added a check if these envs
 exist. Followed asm files are to be generated with CC=gcc and
 ASM=nasm on Linux. See
 `deps/openssl/openssl/crypto/sha/asm/sha512-x86_64.pl`
 - Added new 32bit targets/rules with a sse2 flag (OPENSSL_IA32_SSE2)
 to generate asm for use SSE2.
 - Generating sha512 asm files in x86_64 need output filename which
 has 512. Added new rules so as not to use stdout for outputs.
 - PERLASM_SCHEME of linux-armv4 is `void` as defined in openssl
 Configure. Changed its target/rule and all directories are moved from
 arm-elf-gas to arm-void-gas.

deps: add arm64 support in openssl/asm/Makefile

Fixes: #589
PR-URL: #1389
Reviewed-By: Fedor Indutny <fedor@indutny.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>