encodeProgramHeader

void encodeProgramHeader(ref  const  ProgramHeader phdr,  ubyte[]  data,
       size_t offset,  ElfClass cls,  ElfEndian endian)

Encode a program header into target ELF wire bytes.

`phdr`	The generic program header to encode.
`data`	Destination buffer.
`offset`	Starting offset in data.
`cls`	Target ELF class (32-bit or 64-bit).
`endian`	Target byte order.