port: make matrices work with GBI_FLOATS

add GBI_FLOATS=1 to DEFINES to enable it

not enabling by default yet because not sure if it'll break anything

src/lib/mtx_c.c

@@ -366,6 +366,8 @@ void mtxF2L(Mtxf *src, Mtxf *dst)
 	dst->l[3][2] = src30 << 16 | (src31 & 0xffff);
 	dst->l[3][3] = src32 << 16 | (src33 & 0xffff);
 #else
-	bcopy(src, dst, sizeof(*dst));
+	if (src != dst) {
+		bcopy(src, dst, sizeof(*dst));
+	}
 #endif
 }

src/lib/ultra/gu/mtxutil.c

@@ -2,6 +2,11 @@
 
 void guMtxF2L(f32 mf[4][4], Mtx *m)
 {
+#ifdef GBI_FLOATS
+	if ((Mtx *)mf != m) {
+		bcopy(mf, m, sizeof(*m));
+	}
+#else
 	int	i, j;
 	int	e1, e2;
 	int	*ai, *af;
@@ -18,6 +23,7 @@ void guMtxF2L(f32 mf[4][4], Mtx *m)
 			*(af++) = ((e1 << 16) & 0xffff0000) | (e2 & 0xffff);
 		}
 	}
+#endif
 }
 
 void guMtxIdentF(float mf[4][4])