4259 – Header generation omits leading '@' for properties

The test file:
 class C { @property int get() { return 0; } }
 void main() {}
Generates the header:
 // D import file generated from 'hdrgen.d'
 class C
 {
 property 
 {
 int get()
 {
 return 0;
 }
 }
 }
 void main()
 {
 }
With the '@' missing the header is invalid. This is currently blocking the use of these attributes in druntime. I've attached a patch that fixes the issue, but there's likely a better way to do it.

http://www.dsource.org/projects/dmd/changeset/513