gpg: Improve check for already compressed packets.
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Description

gpg: Improve check for already compressed packets.

* common/miscellaneous.c (is_openpgp_compressed_packet): New.
(is_file_compressed): Rerad 2 more bytes and call new function.

Note that this does not yet allow to detect compressed data piped to
gpg. This requires a proper read-ahead in iobuf.c which is
complicated due to the auto-removal of filter functions. Thus such an
read-ahead needs to be done in the I/O backend of iobuf.