UnitTest: test that the function pointer for vfpu_sincos() is non-null

unittest/UnitTest.cpp

@@ -298,6 +298,7 @@ bool TestParsers() {
 
 bool TestVFPUSinCos() {
 	float sine, cosine;
+	EXPECT_FALSE(vfpu_sincos == nullptr);
 	vfpu_sincos(0.0f, sine, cosine);
 	EXPECT_EQ_FLOAT(sine, 0.0f);
 	EXPECT_EQ_FLOAT(cosine, 1.0f);