File krb5-appl-fix-build.patch of Package krb5-appl

This patch fixes build issues.

--- krb5-appl-1.0.3/configure.ac.orig	2023-09-01 14:00:00.000000000 +0200
+++ krb5-appl-1.0.3/configure.ac	2023-09-01 14:05:00.000000000 +0200
@@ -25,6 +25,7 @@ AC_INIT([KRB5 Application Suite], [1.0.3], [bug-report@krb5.org])
 AC_CONFIG_SRCDIR([README])
 AC_CONFIG_AUX_DIR([config])
 AM_INIT_AUTOMAKE([-Wall foreign subdir-objects])
+AC_PROG_CC_C99
 
 AC_PROG_CC
 AC_PROG_INSTALL
@@ -32,6 +33,7 @@ AC_PROG_MAKE_SET
 AC_PROG_RANLIB
 AC_CHECK_HEADERS([arpa/inet.h fcntl.h netdb.h netinet/in.h stdlib.h string.h sys/socket.h unistd.h])
 AC_CHECK_FUNCS([memset socket strdup strerror strstr])
+AC_SEARCH_LIBS([clock_gettime], [rt posix4])
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST