update bindings

update bindings

by running
`h2xs -P -v 1.0 -F -DHAVE_MMAP -M '^XDG_' -Ofan Xdgmime xdgmime.h`

and selectively adding changes.

upstream xdgmime.h contains all functions also as defines
(preprocessor mangling to add XDG_PREFIX to the function name) - thus
all functions would also be added as constants, which leads to errors
in the automatically generated tests. The functions need to be in
EXPORT_OK, but not added to @names in Makefile.PL.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>