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

ps/display.c

@@ -55,7 +55,7 @@ static void signal_handler(int signo){
     signo,
     signal_number_to_name(signo),
     myname,
-    procps_version
+    PACKAGE_VERSION
   );
   switch (signo) {
     case SIGHUP:

ps/global.c

@@ -479,7 +479,7 @@ void self_info(void){
     sysv_l_format  ? sysv_l_format  : "(none)"
   );
 
-  display_version();
+  fprintf(stderr, "%s version %s\n", PACKAGE_NAME, PACKAGE_VERSION);
   fprintf(stderr, "Linux version %d.%d.%d\n",
     LINUX_VERSION_MAJOR(linux_version_code),
     LINUX_VERSION_MINOR(linux_version_code),

ps/parser.c

@@ -32,9 +32,9 @@
 #include <sys/types.h>
 
 #include "../proc/alloc.h"
-#include "../proc/version.h"
 
 #include "common.h"
+#include "c.h"
 
 #define ARG_GNU  0
 #define ARG_END  1
@@ -58,6 +58,11 @@ static int force_bsd = 0;  /* set when normal parsing fails */
   return _("the option is exclusive: " x)
 
 /********** utility functions **********/
+static void display_ps_version(void)
+{
+    fprintf(stdout, PROCPS_NG_VERSION);
+}
+
 
 /*
  * Both "-Oppid" and "-O ppid" should be legal, though Unix98
@@ -341,7 +346,7 @@ static const char *parse_sysv_option(void){
     case 'V': /* single */
       trace("-V prints version\n");
       exclusive("-V");
-      display_version();
+      display_ps_version();
       exit(0);
     // This must be verified against SVR4-MP. (UnixWare or Powermax)
     // Leave it undocumented until that problem is solved.
@@ -610,7 +615,7 @@ static const char *parse_bsd_option(void){
     case 'V': /* single */
       trace("V show version info\n");
       exclusive("V");
-      display_version();
+      display_ps_version();
       exit(0);
     case 'W':
       trace("W N/A get swap info from ... not /dev/drum.\n");
@@ -1029,7 +1034,7 @@ static const char *parse_gnu_option(void){
   case_version:
     trace("--version\n");
     exclusive("--version");
-    display_version();
+    display_ps_version();
     exit(0);
     return NULL;
   case_context: