The glibc headers do not declare bsd_signal by default.  Call signal
instead, which is the same function as bsd_signal in current glibc.

This fixes implicit function declarations and avoids build issues with
future compilers.

Index: tftp-hpa-5.2/tftp/main.c
===================================================================
--- tftp-hpa-5.2.orig/tftp/main.c
+++ tftp-hpa-5.2/tftp/main.c
@@ -306,7 +306,7 @@ int main(int argc, char *argv[])
         sp->s_proto = (char *)"udp";
     }
 
-    bsd_signal(SIGINT, intr);
+    signal(SIGINT, intr);
 
     if (peerargc > 1) {
         /* Set peer */
@@ -772,7 +772,7 @@ void intr(int sig)
 {
     (void)sig;                  /* Quiet unused warning */
 
-    bsd_signal(SIGALRM, SIG_IGN);
+    signal(SIGALRM, SIG_IGN);
     alarm(0);
     siglongjmp(toplevel, -1);
 }
Index: tftp-hpa-5.2/tftp/tftp.c
===================================================================
--- tftp-hpa-5.2.orig/tftp/tftp.c
+++ tftp-hpa-5.2/tftp/tftp.c
@@ -85,7 +85,7 @@ void tftp_sendfile(int fd, const char *n
     is_request = 1;             /* First packet is the actual WRQ */
     amount = 0;
 
-    bsd_signal(SIGALRM, timer);
+    signal(SIGALRM, timer);
     do {
         if (is_request) {
             size = makerequest(WRQ, name, dp, mode) - 4;
@@ -191,7 +191,7 @@ void tftp_recvfile(int fd, const char *n
     firsttrip = 1;
     amount = 0;
 
-    bsd_signal(SIGALRM, timer);
+    signal(SIGALRM, timer);
     do {
         if (firsttrip) {
             size = makerequest(RRQ, name, ap, mode);