Invoke MSBuild specifying the target platform as generated by Gyp.

Reviewed-By: James M Snell <jasnell@gmail.com>
PR-URL: #5627

openssl-1.0.1s disables EXPORT and LOW ciphers by default.
They are obsoleted ciphers and not safe for the current use.
Node LTS also deprecates them.

Fixes: nodejs/Release#85
PR-URL: #5712
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

DES-CBC-SHA is LOW cipher and disabled by default and it is used in
tests of hornorcipherorder. They are changed as to

- use RC4-SHA instead of DES-CBC-SHA.
- add AES128-SHA to entries to keep the number of ciphers.
- remove tests for non-default cipher because only SEED and IDEA are
available in !RC4:!HIGH:ALL.

Fixes: nodejs/Release#85
PR-URL: #5712
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Notable changes:

* npm: Upgrade to v2.15.1. IMPORTANT: This is a major upgrade to npm
  v2 LTS from the previously deprecated npm v1. (Forrest L Norvell)
* openssl: OpenSSL v1.0.1s disables the EXPORT and LOW ciphers as they
  are obsolete and not considered safe. This release of Node.js turns
  on `OPENSSL_NO_WEAK_SSL_CIPHERS` to fully disable the 27 ciphers
  included in these lists which can be used in SSLv3 and higher. Full
  details can be found in our LTS discussion on the matter
  (nodejs/Release#85).
  (Shigeki Ohtsu) #5712