Remove buildtime from binaries to avoid unnecessary change in ELF data.

--- a/unix/vncconfig/buildtime.c	2017-03-11 07:16:26.183735940 +0000
+++ b/unix/vncconfig/buildtime.c	2017-03-11 07:16:39.430141048 +0000
@@ -15,4 +15,3 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
  * USA.
  */
-char buildtime[] = __DATE__ " " __TIME__;
--- a/unix/x0vncserver/buildtime.c	2017-03-11 07:17:57.463804435 +0000
+++ b/unix/x0vncserver/buildtime.c	2017-03-11 07:18:05.366932835 +0000
@@ -15,4 +15,3 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
  * USA.
  */
-char buildtime[] = __DATE__ " " __TIME__;
--- a/unix/x0vncserver/x0vncserver.cxx	2017-03-11 07:18:21.907552984 +0000
+++ b/unix/x0vncserver/x0vncserver.cxx	2017-03-11 07:18:47.120136121 +0000
@@ -56,8 +56,6 @@
 #include <sys/proto.h>
 #endif
 
-extern char buildtime[];
-
 using namespace rfb;
 using namespace network;
 
@@ -412,8 +410,8 @@
 
 static void printVersion(FILE *fp)
 {
-  fprintf(fp, "TigerVNC Server version %s, built %s\n",
-          PACKAGE_VERSION, buildtime);
+  fprintf(fp, "TigerVNC Server version %s\n",
+          PACKAGE_VERSION);
 }
 
 static void usage()
--- a/unix/xserver/hw/vnc/xvnc.c	2017-03-11 07:19:51.661067238 +0000
+++ b/unix/xserver/hw/vnc/xvnc.c	2017-03-11 07:20:31.799071698 +0000
@@ -79,7 +79,6 @@
 #include "dpmsproc.h"
 #endif
 #include <X11/keysym.h>
-  extern char buildtime[];
 #undef VENDOR_RELEASE
 #undef VENDOR_STRING
 #include "version-config.h"
@@ -157,7 +156,7 @@
 static void
 vncPrintBanner(void)
 {
-    ErrorF("\nXvnc %s - built %s\n%s", XVNCVERSION, buildtime, XVNCCOPYRIGHT);
+    ErrorF("\nXvnc %s \n%s", XVNCVERSION, XVNCCOPYRIGHT);
     ErrorF("Underlying X server release %d, %s\n\n", VENDOR_RELEASE,
            VENDOR_STRING);
 }