5166 sendmail package should be replaceable

*** 32,42 ****
  #include <unistd.h>
  #include <sysexits.h>
  #include <errno.h>
  #include <auth_list.h>
  
! #define _PATH_SENDMAIL_BIN      "/usr/lib/sendmail"
  
  int
  main(int argc, char *argv[], char *envp[])
  {
          struct passwd *pw = getpwuid(getuid());
--- 32,42 ----
  #include <unistd.h>
  #include <sysexits.h>
  #include <errno.h>
  #include <auth_list.h>
  
! #define _PATH_SENDMAIL_BIN      "/usr/lib/smtp/sendmail/sendmail"
  
  int
  main(int argc, char *argv[], char *envp[])
  {
          struct passwd *pw = getpwuid(getuid());