Upgrading to doctest 2.4.9 to fix error on iOS (#391)

UnitTests/Geometry/EPATests.cpp

@@ -189,7 +189,8 @@ TEST_SUITE("EPATests")
 		Sphere sphere(Vec3(0, 0, 0), 1.0f);
 		EPAPenetrationDepth epa;
 		float lambda = 1.0f + FLT_EPSILON;
-		Vec3 pa, pb, normal;
+		const Vec3 invalid(-999, -999, -999);
+		Vec3 pa = invalid, pb = invalid, normal = invalid;
 		CHECK(epa.CastShape(Mat44::sTranslation(Vec3(-1, 0, 0)), Vec3(10, 0, 0), 1.0e-4f, 1.0e-4f, sphere, sphere, 0.0f, 0.0f, true, lambda, pa, pb, normal));
 		CHECK(lambda == 0.0f);
 		CHECK_APPROX_EQUAL(pa, Vec3::sZero(), 5.0e-3f);
@@ -202,7 +203,8 @@ TEST_SUITE("EPATests")
 		Sphere sphere(Vec3(0, 0, 0), 1.0f);
 		EPAPenetrationDepth epa;
 		float lambda = 1.0f + FLT_EPSILON;
-		Vec3 pa, pb, normal;
+		const Vec3 invalid(-999, -999, -999);
+		Vec3 pa = invalid, pb = invalid, normal = invalid;
 		CHECK(epa.CastShape(Mat44::sTranslation(Vec3(-10, 0, 0)), Vec3(20, 0, 0), 1.0e-4f, 1.0e-4f, sphere, sphere, 0.0f, 0.0f, true, lambda, pa, pb, normal));
 		CHECK_APPROX_EQUAL(lambda, 8.0f / 20.0f);
 		CHECK_APPROX_EQUAL(pa, Vec3(-1, 0, 0));