netsniff-ng: Don't duplicate copyright/bug report/license string

Move the copyright/bug report/license string to an own constant and use
it for the output of help() and version() to avoid duplication and
prevent the strings from getting out of sync. This makes the text
section of netsniff-ng.o slightly smaller:

before:
   text	   data	    bss	    dec	    hex	filename
  26998	      8	     68	  27074	   69c2	netsniff-ng/netsniff-ng.o

after:
   text	   data	    bss	    dec	    hex	filename
  26582	      8	     68	  26658	   6822	netsniff-ng/netsniff-ng.o

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

0 files changed, 0 insertions, 0 deletions