package/asterisk: needs threads

Fixes:
 - http://autobuild.buildroot.org/results/85d30a4f94efa868a9155f7dda593ba8079063b5

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

package/asterisk/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_ASTERISK
 	depends on !BR2_STATIC_LIBS # dlfcn.h
 	depends on !BR2_TOOLCHAIN_USES_MUSL
 	depends on BR2_USE_MMU # libedit
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_WCHAR # libedit
 	select BR2_PACKAGE_JANSSON
 	select BR2_PACKAGE_LIBCURL
@@ -24,7 +25,8 @@ config BR2_PACKAGE_ASTERISK
 
 	  http://www.asterisk.org/
 
-comment "asterisk needs a glibc or uClibc toolchain w/ C++, dynamic library, wchar"
+comment "asterisk needs a glibc or uClibc toolchain w/ C++, dynamic library, threads, wchar"
 	depends on BR2_USE_MMU
 	depends on BR2_TOOLCHAIN_USES_MUSL || !BR2_INSTALL_LIBSTDCPP \
-		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR
+		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS \
+		|| !BR2_USE_WCHAR