Simplify the deflate, zlib, and gzip decompression code by assuming
that all content is fully accessible via pointer dereferences.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The memcpy_user(), memmove_user(), memcmp_user(), memset_user(), and
strlen_user() functions are now just straightforward wrappers around
the corresponding standard library functions.
Remove these redundant wrappers.
Signed-off-by: Michael Brown <mcb30@ipxe.org>