Remove NaN-check C assert calls in line drawing code.

Users can pass NaN point values into line drawing code. love shouldn't abort the entire program if that happens.

src/modules/graphics/Polyline.cpp

@@ -24,7 +24,6 @@
 
 // C++
 #include <algorithm>
-#include <assert.h>
 
 // treat adjacent segments with angles between their directions <5 degree as straight
 static const float LINES_PARALLEL_EPS = 0.05f;
@@ -192,7 +191,6 @@ void MiterJoinPolyline::renderEdge(std::vector<Vector2> &anchors, std::vector<Ve
 	if (fabs(det) / (len_s * len_t) < LINES_PARALLEL_EPS && Vector2::dot(s, t) > 0)
 	{
 		// lines parallel, compute as u1 = q + ns * w/2, u2 = q - ns * w/2
-		assert(ns == ns); //NaN check
 		normals.push_back(ns);
 		normals.push_back(-ns);
 	}
@@ -201,7 +199,6 @@ void MiterJoinPolyline::renderEdge(std::vector<Vector2> &anchors, std::vector<Ve
 		// cramers rule
 		float lambda = Vector2::cross((nt - ns), t) / det;
 		Vector2 d = ns + s * lambda;
-		assert(d == d); //NaN check
 		normals.push_back(d);
 		normals.push_back(-d);
 	}