Pass multiple parameters to makensis

This will allow to build project with adiitional parameters.
`example.sublime-project`:
```javascript
{
...
	"build_systems":
	[
		{
			"name": "example_nsis",
...
			"cmd": ["$packages/NSIS/nsis_build.bat", "u", "/DFOOBAR", "$project_path/example.nsi"]
...
		}
	]
}
```