appendheader - add DHTB to boot.img

For every device that need "DHTB" string to boot
written in c
Tried and worked for gtexswifi ✅️

minimal usage

./appendheader -i [input file]
default output file name is boot.img

advanced usage

./appendheader -i [input file] -o [output file name]
for save input and output files (because why not)