!5 fix build error with gcc 10

From: @eaglegai
Reviewed-by: @zengwefeng
Signed-off-by: @zengwefeng

tftp-hpa-5.2-gcc10.patch

@@ -0,0 +1,12 @@
+diff -up tftp-hpa-5.2/tftp/tftp.c.gcc10 tftp-hpa-5.2/tftp/tftp.c
+--- tftp-hpa-5.2/tftp/tftp.c.gcc10	2020-05-04 00:56:28.787896509 +0200
++++ tftp-hpa-5.2/tftp/tftp.c	2020-05-04 00:58:42.502901005 +0200
+@@ -48,7 +48,7 @@ extern int maxtimeout;
+ #define PKTSIZE    SEGSIZE+4
+ char ackbuf[PKTSIZE];
+ int timeout;
+-sigjmp_buf toplevel;
++extern sigjmp_buf toplevel;
+ sigjmp_buf timeoutbuf;
+ 
+ static void nak(int, const char *);

tftp.spec

@@ -1,6 +1,6 @@
 Name:          tftp
 Version:       5.2
-Release:       29
+Release:       30
 Summary:       The client for the Trivial File Transfer Protocol (TFTP)
 License:       BSD
 Group:         Applications/Internet
@@ -18,6 +18,7 @@ Patch0007:     tftp-hpa-0.49-stats.patch
 Patch0008:     tftp-hpa-5.2-pktinfo.patch
 Patch0009:     tftp-doc.patch
 Patch0010:     tftp-enhanced-logging.patch
+Patch0011:     tftp-hpa-5.2-gcc10.patch
 
 BuildRequires: readline-devel autoconf systemd-units
 BuildRequires: gcc
@@ -85,6 +86,12 @@ install -p -m 0644 %{SOURCE2} %{buildroot}%{_unitdir}
 
 
 %changelog
+* Fri Jul 30 2021 gaihuiying <gaihuiying1@huawei.com> - 5.2-30
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:fix build error with gcc 10
+
 * Thu May 27 2021 lijingyuan <lijingyuan3@huawei.com> - 5.2-29
 - Type:bugfix 
 - ID:NA