library: eliminate all dependencies on alloc.h/alloc.c

While that old master branch library may utilize those
memory allocation functions found in the alloc module,
it was inappropriate for this newlib branch to subject
callers to a stderr message followed by an early exit.

Of course, the old libprocps offered a message handler
override provision (xalloc_err_handler) but that, too,
would seem to be inappropriate for our modern library.

[ remember the battles fought with that damn libnuma ]

So, this commit will tweak those old inherited sources
setting the stage for standardized return values/errno
settings in connection with a memory allocation error.

------------------------------------------------------
Along the way, we'll address the following miscellany:

. Completely eliminate usage of anything from alloc.h.
This, of course, entails our own error checking of the
alternative allocation calls from stdlib.h & string.h.

. Eliminate use of the strdup function where possible,
as with 'procps_uptime' and 'procps_loadavg' routines.

. Whack some obsolete code (getslabinfo) in sysinfo.c.

Signed-off-by: Jim Warner <james.warner@comcast.net>

proc/sysinfo.h

@@ -6,25 +6,10 @@
 #include <features.h>
 __BEGIN_DECLS
 
-extern int have_privs;             /* boolean, true if setuid or similar */
-
 long procps_cpu_count(void);
 long procps_hertz_get(void);
 int procps_loadavg(double *av1, double *av5, double *av15);
 unsigned int procps_pid_length(void);
 
-#define BUFFSIZE (64*1024)
-
-typedef struct slab_cache{
-	char name[48];
-	unsigned active_objs;
-	unsigned num_objs;
-	unsigned objsize;
-	unsigned objperslab;
-}slab_cache;
-
-extern unsigned int getslabinfo (struct slab_cache**);
-
-
 __END_DECLS
 #endif /* SYSINFO_H */