test for linux/pkt-sched.h rather than SO_PRIORITY

configure.ac

@@ -233,7 +233,11 @@ AC_ARG_ENABLE(shadow,
 # Checks for header files.
 AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
-AC_CHECK_HEADERS([fcntl.h limits.h netinet/in.h netinet/tcp.h stdlib.h string.h sys/socket.h sys/time.h termios.h unistd.h crypt.h pty.h ioctl.h libutil.h libgen.h inttypes.h stropts.h utmp.h utmpx.h lastlog.h paths.h util.h netdb.h security/pam_appl.h pam/pam_appl.h netinet/in_systm.h sys/uio.h])
+AC_CHECK_HEADERS([fcntl.h limits.h netinet/in.h netinet/tcp.h stdlib.h \
+	string.h sys/socket.h sys/time.h termios.h unistd.h crypt.h \
+	pty.h ioctl.h libutil.h libgen.h inttypes.h stropts.h utmp.h \
+	utmpx.h lastlog.h paths.h util.h netdb.h security/pam_appl.h \
+	pam/pam_appl.h netinet/in_systm.h sys/uio.h linux/pkt_sched.h])
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST

includes.h

@@ -156,7 +156,7 @@ typedef unsigned int u_int32_t;
 typedef u_int32_t uint32_t;
 #endif /* HAVE_UINT32_T */
-#ifdef SO_PRIORITY
+#ifdef HAVE_LINUX_PKT_SCHED_H
 #include <linux/types.h>
 #include <linux/pkt_sched.h>
 #endif

netio.c

@@ -306,7 +306,7 @@ void set_sock_priority(int sock, enum dropbear_prio prio) {
 #ifdef IPTOS_LOWDELAY
 	int iptos_val = 0;
 #endif
-#ifdef SO_PRIORITY
+#ifdef HAVE_LINUX_PKT_SCHED_H
 	int so_prio_val = 0;
 #endif
@@ -333,7 +333,7 @@ void set_sock_priority(int sock, enum dropbear_prio prio) {
 	}
 #endif
-#ifdef SO_PRIORITY
+#ifdef HAVE_LINUX_PKT_SCHED_H
 	if (prio == DROPBEAR_PRIO_LOWDELAY) {
 		so_prio_val = TC_PRIO_INTERACTIVE;
 	} else if (prio == DROPBEAR_PRIO_BULK) {