library: remove procps_version functions

It doesn't make any sense to have the binary version strings
embedded into the library. The version strings are defined
already either in the Makefile or in include/c.h

proc/libprocps.sym

@@ -4,7 +4,6 @@ global:
 	closeproc;
 	cpuinfo;
 	dev_to_tty;
-	display_version;
 	escape_command;
 	escape_str;
 	escape_strlist;
@@ -47,7 +46,6 @@ global:
 	page_bytes;
 	pretty_print_signals;
 	print_uptime;
-	procps_version;
 	put_slabinfo;
 	readeither;
 	readproc;

proc/version.c

@@ -24,12 +24,6 @@
 #include <stdlib.h>
 #include "version.h"
 
-const char procps_version[] = PACKAGE_NAME " version " PACKAGE_VERSION;
-
-void display_version(void) {
-    fprintf(stdout, "%s\n", procps_version);
-}
-
 /* Linux kernel version information for procps-ng utilities
  * Copyright (c) 1996 Charles Blake <cblake@bbn.com>
  */

proc/version.h

@@ -15,8 +15,6 @@
 EXTERN_C_BEGIN
 
 void init_Linux_version(void);    /* Get Linux version */
-extern void display_version(void);	/* display suite version */
-extern const char procps_version[];		/* global buf for suite version */
 
 extern int linux_version_code;		/* runtime version of LINUX_VERSION_CODE
 					   in /usr/include/linux/version.h */