build: enable openssl support for mips64el

V8 now resume supporting for mipsel/mips64el.
This commit add linux64-mips64 platform dependent
files in 'deps/openssl/config/archs/linux64-mips64',
and update the corresponding gypi files and header
files.

Refs: https://groups.google.com/forum/#!topic/v8-dev/oXkv5OVCXyc

PR-URL: #27992
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>

Author: mutao-loongson

deps/openssl/config/Makefile

@@ -12,7 +12,7 @@ PERL    = perl
 ASM_ARCHS = aix-gcc aix64-gcc BSD-x86_64 \
 darwin64-x86_64-cc darwin-i386-cc linux-aarch64 \
 linux-armv4 linux-elf linux-x32 linux-x86_64 linux-ppc \
-linux-ppc64 linux-ppc64le linux32-s390x linux64-s390x \
+linux-ppc64 linux-ppc64le linux32-s390x linux64-s390x linux64-mips64\
 solaris-x86-gcc solaris64-x86_64-gcc VC-WIN64A VC-WIN32
 
 NO_ASM_ARCHS = VC-WIN64-ARM