Fix release float printing errors

Fixes #564.
Fixes #669.
Fixes #928.

Author: tiehuis

std/fmt/errol/index.zig

@@ -259,6 +259,9 @@ fn gethi(in: f64) f64 {
 /// Normalize the number by factoring in the error.
 ///   @hp: The float pair.
 fn hpNormalize(hp: &HP) void {
+    // Required to avoid segfaults causing buffer overrun during errol3 digit output termination.
+    @setFloatMode(this, @import("builtin").FloatMode.Strict);
+
     const val = hp.val;
 
     hp.val += hp.off;