More lenient pdb header check
More lenient pdb header check

ttRevan/cecil,kzu/cecil,jbevain/cecil,fnajera-rac-de/cecil,cgourlay/cecil,saynomoo/cecil,xen2/cecil,joj/cecil,SiliconStudio/Mono.Cecil,mono/cecil,gluck/cecil,sailro/cecil,furesoft/cecil