Fix test floating point comparison to tolerate imprecise FPUs.

src/test/run-pass/utf8_idents.rs

@@ -1,7 +1,8 @@
 fn main() {
+    let ε = 0.00001;
     let Π = 3.14;
     let लंच = Π * Π + 1.54;
-    assert लंच - 1.54 == Π * Π;
+    assert float::abs((लंच - 1.54) - (Π * Π)) < ε;
     assert საჭმელად_გემრიელი_სადილი() == 0;
 }