test: Fix some more run-pass bustage. rs=clownshoes

Author: pcwalton

src/test/run-pass/exterior.rs

@@ -8,7 +8,7 @@ fn f(p: @point) { assert (p.z == 12); p.z = 13; assert (p.z == 13); }
 
 fn main() {
     let a: point = {x: 10, y: 11, mut z: 12};
-    let b: @point = @a;
+    let b: @point = @copy a;
     assert (b.z == 12);
     f(b);
     assert (a.z == 12);

src/test/run-pass/intrinsics-math.rs

@@ -51,7 +51,7 @@ fn main() {
     assert(powf32(25f32, -2f32) == 0.0016f32);
     assert(powf64(400f64, 0.5f64) == 20f64);
 
-    assert(expf32(1f32) == f32::consts::e);
+    assert(fabsf32(expf32(1f32) - f32::consts::e) < 0.000001f32);
     assert(expf64(1f64) == f64::consts::e);
 
     assert(exp2f32(10f32) == 1024f32);