Consider increasing the size of static magic at the beginning of header

[cyberixae]

I have been lately working on magic signatures for the unix file utility. The utility and the related libmagic library are used to determine file types of arbitrary data files. According to contribution rules of the project, matches of less or equal to 16 bits are forbidden. Thus, adding support for ZSM files in their current form might not be possible. According to the rules a magic id with length of 32 bits should be ok as long as it does not clash with existing signatures.