allow wmf header to be placed on position aligned to 4 bytes
allow wmf header to be placed on position aligned to 4 bytes

 - because there are such buggy emf files flying around (n#705956)

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core