Log Message:
Updating libstatgrab from 0.17nb2 to 0.90

pkgsrc changes:
* libstatgrab has gnu-lgpl-2, only statgrab and saidard are gpl
* add dependency to log4cplus for have tracing ability

Upstream changes (0.90 follows 0.17 immediately):
libstatgrab 0.90
 * Please note the API in 0.90 has changed, so applications using
   libstatgrab will need to be updated to support the changes.

 * Thread safety and reentrant functions.
 * API unification (every stats call is now able to return multiple entries).
 * Complete rewrite of internal memory management (eases future extensions).
 * Add experimental support for tracing using log4cplus.
 * Complete the ports for AIX, HP-UX and most of the widely used
   BSD-based operating systems.
 * Complete the port for Darwin/MacOS X including basic Mach.
 * Clean up the FreeBSD and Solaris implementations.
 * Remove explicit support for Linux 2.4.