package/daq3: fix build without threads

pcap module and example unconditionally uses pthread.h

Fixes:
 - http://autobuild.buildroot.org/results/b618bcca1a83704f7f15e76cd1e7f1117cbbd464

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/daq3/0001-add-disable-example.patch

@@ -0,0 +1,49 @@
+From 1d7031dde8da39cd2151f87d68dddea91f304603 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sat, 19 Jun 2021 11:31:35 +0200
+Subject: [PATCH] add --disable-example
+
+Add --disable-example to be able to build daq on toolchains without
+threads support
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/snort3/libdaq/pull/13]
+---
+ Makefile.am  | 5 ++++-
+ configure.ac | 5 +++++
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/Makefile.am b/Makefile.am
+index dcba62b..0a79319 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -7,6 +7,9 @@ pkgconfig_DATA = libdaq.pc
+ if BUILD_MODULES
+     MODULES_DIR = modules
+ endif
+-SUBDIRS = api $(MODULES_DIR) example test
++SUBDIRS = api $(MODULES_DIR) test
++if BUILD_EXAMPLE
++    SUBDIRS += example
++endif
+ 
+ ACLOCAL_AMFLAGS = -I m4
+diff --git a/configure.ac b/configure.ac
+index 23b38a2..36a09ee 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -274,6 +274,11 @@ AM_CONDITIONAL([BUILD_MODULES], [test "$enable_afpacket_module" = yes -o \
+ 
+ LIBS=${save_LIBS}
+ 
++AC_ARG_ENABLE(example,
++              AS_HELP_STRING([--disable-example],[do not build the example]),
++              [enable_example="$enableval"], [enable_example=yes])
++AM_CONDITIONAL([BUILD_EXAMPLE], [test "$enable_example" = yes])
++
+ AC_CHECK_LIB([dl], [dlopen], [LIBDL="-ldl"])
+ 
+ AM_CONDITIONAL([BUILD_SHARED_MODULES], [ test "$enable_shared" = yes ])
+-- 
+2.30.2
+

package/daq3/daq3.mk

@@ -12,6 +12,7 @@ DAQ3_INSTALL_STAGING = YES
 DAQ3_DEPENDENCIES = host-pkgconf
 # From git
 DAQ3_AUTORECONF = YES
+DAQ3_CONF_OPTS = --disable-example
 
 ifeq ($(BR2_PACKAGE_LIBNETFILTER_QUEUE),y)
 DAQ3_DEPENDENCIES += libnetfilter_queue
@@ -20,7 +21,7 @@ else
 DAQ3_CONF_OPTS += --disable-nfq-module
 endif
 
-ifeq ($(BR2_PACKAGE_LIBPCAP),y)
+ifeq ($(BR2_PACKAGE_LIBPCAP)$(BR2_TOOLCHAIN_HAS_THREADS),yy)
 DAQ3_DEPENDENCIES += libpcap
 DAQ3_CONF_OPTS += --enable-pcap-module
 else