library: remove procps_pagesize_get()

This is actually a systemcall getpagesize(2) or it is defined
in configure using a variety of methods, including a default
hard coded value as a last resort.

There is no need to have this in libprocps

proc/sysinfo.c

@@ -113,22 +113,6 @@ PROCPS_EXPORT long procps_hertz_get(void)
     return 100;
 }
 
-/*
- * procps_pagesize_get:
- *
- * Return the size of pages in bytes
- *
- * Returns: size of pages in bytes
- */
-PROCPS_EXPORT long procps_pagesize_get(void)
-{
-    long psiz;
-
-    if ((psiz = sysconf(_SC_PAGESIZE)) > 0)
-        return psiz;
-    return 1;
-}
-
 /*
  * procps_loadavg:
  * @av1: location to store 1 minute load average