[Renderers/SDL2] add rounded corner borders and fixed maximum radius issues. #258
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Added a function to create rounded corner borders, in the same fashion as the rounded corner rectangle function.
Changed the border render section to call the new function for the four corners and to account for bounding box being smaller than combined border widths.
Also fixed one typo and added a conditional M_PI define if cmath constant is not present.
Fixes issue 257.