Move to extension building process.

Going ahead with a pull-request, would fix #5.

Short summary of what this does, exactly.

1. It implements the ability to staticly, yes *staticly* build php_winbinder into your php distribution thus removing the need for an external DLL (makes it much smaller aswell).

2. Much faster compile time, and less of a hassle to build it. (Much easier for "noobs" to build it)

3. Drops Windows XP targeting (Since; 1. Windows XP isn't supported by Microsoft anymore, and 2. PHP 5.5, 5.6 don't support it. Times are changing). Instead it now targets Windows 7.

4. Enhances some of the code, including removing some repetitiveness.