add legacy functions from sysinfo.h duplicating sysconf functionality

src/conf/legacy.c

+#include <sys/sysinfo.h>
+#include <unistd.h>
+
+int get_nprocs_conf()
+{
+	return sysconf(_SC_NPROCESSORS_CONF);
+}
+
+int get_nprocs()
+{
+	return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+long get_phys_pages()
+{
+	return sysconf(_SC_PHYS_PAGES);	
+}
+
+long get_avphys_pages()
+{
+	return sysconf(_SC_AVPHYS_PAGES);	
+}