src: remove use of the __P() macro

The __P() macro is a legacy compatibility macro aimed making pre-ANSI
(i.e. K&R) compilers that do not support function prototypes happy,
while still allowing such prototypes for ANSI-compliant compilers.

Since virtually all compilers have been ANSI-compliant for a few decades
now, use of __P() is totally useless.

Furthermore, __P() is defined in the non-standard sys/cdefs.h header.
This header is present in glibc and uClibc, and both have it included
from many of their headers. So, sys/cdefs.h is automagically included in
most cases and its macros are available.

However, the musl C library does not provide this sys/cdefs.h header.
Thus, the build breaks on musl.

For all the above reasons, get rid of __P() wherever it is used; just
always declare real function prototypes.

Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Steve Dickson <steved@redhat.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Steve Dickson <SteveD@redhat.com>
Cc: Mike Frysinger <vapier@gentoo.org>

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