Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Rename all symbols in libmp(3) to mp_*, just like Solaris.

The function pow() in libmp(3) clashes with pow(3) in libm. We could
rename this single function, but we can just take the same approach as
the Solaris folks did, which is to prefix all function names with mp_.

libmp(3) isn't really popular nowadays. I suspect not a single
application in ports depends on it. There's still a chance, so I've
increased the SHLIB_MAJOR and __FreeBSD_version.

Reviewed by: deischen, rdivacky

Pass BN_CTX to internal functions instead of allocating it internally.
This allows msqrt() to only call BN_CTX_new() once intead of many times.

Suggested and reviewed by: stefanf

Do not put BN_CTX structures on the stack, but instead allocate them
runtime using BN_CTX_new(). This is done since in OpenSSL 0.9.7e we
can only allocate BN_CTX on the stack by including an internal OpenSSL
header file, and in OpenSSL 0.9.8 BN_CTX is entirely opaque, so having
it on the stack is not possible at all.

This is done as preparation for OpenSSL 0.9.8b import.

Tested on: amd64 i386 ia64
Tested with: src/tools/regression/lib/libmp

Adjust for OpenSSL 0.9.7.

Add __FBSDID()s to libmp

This is the traditional BSD libmp interface implemented in terms of
the OpenSSL BIGNUM interface. It is provided for compatibility only
and should not be used in new code.