Remove compression header structure name authored by Nico Bendlin's avatar Nico Bendlin
Transparent stream compression is always optional. Compressed data is recognized by the four-byte magic value `1 76 79 66`.
```c
struct am2lob {
struct {
uint8_t magic[4]; // {0x01, 0x4C, 0x4F, 0x42} ("\1LOB")
uint8_t method; // has to be 6 for Ambermoon
uint8_t rawSize[3]; // big-endian size of uncompressed data
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