[WIP] Fixed the platform detection for 32-Bits or 64-Bits

| Q             | A
| ------------- | ---
| Bug fix?      | yes (supposed)
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Related tickets | 
| License       | GNU GPL v3

- [ ] Added a test for detecting the right architecture
- [ ] Running test under Windows 64 bits platform

If running `cyg-apt` on Windows 64 bits and with a python 64 bits then It is not an obligation that the Cygwin platform is also on 64-bit. To avoid that indecision maybe we should add an `architecture` configuration field for the version 1.2.

However I was not successfully used `cyg-apt` outside Cygwin, I'll try try again. This is another issue but this issue need it. Moreover I cannot tests it on 64 bits architecture.

So for the moments we cannot say it works for 64 bits architecture without an efficient test suite.