evas map: fix the rendering problem.

evas map: fix the rendering problem.

I got an issue report about map rendering.
After investigated, I found that was introduced by data overflow.

For fast computation, evas map uses integer data type rather than float,
that gives up some range of data size.

So, if vertex range is a little large but still reasonable,
polygon won'be properly displayed due to the integer overflow.

We can fix this by changing FPc data type to 64 bits (ie, long long)
But I didn't do yet though I can simply fix this costlessly.

By the way, my test case map points are below.

0: -1715, -5499
1: -83, -1011
2: 1957, 5721
3: 325, 1233

and gl result is perfect but sw is totally broken.

@fix