package/libks: needs NPTL

libks needs NPTL since its addition in commit
5752d18bfcdb060c9d3b8c13330344cbdee74b75:

/nvmedata/autobuild/instance-17/output-1/build/libks-1.8.0/src/ks_thread.c: In function 'thread_launch':
/nvmedata/autobuild/instance-17/output-1/build/libks-1.8.0/src/ks_thread.c:237:21: error: 'pthread_setname_np' undeclared (first use in this function); did you mean 'pthread_setcanceltype'?
  237 |  if (thread->tag && pthread_setname_np)
      |                     ^~~~~~~~~~~~~~~~~~
      |                     pthread_setcanceltype

Fixes:
 - http://autobuild.buildroot.org/results/8a93b75ee51e005383eac17aa7577b43eda4cd92

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libks/Config.in

@@ -2,7 +2,7 @@ config BR2_PACKAGE_LIBKS
 	bool "libks"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on !BR2_STATIC_LIBS # dlfcn.h
-	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL # pthread_setname_np()
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_UTIL_LINUX
 	select BR2_PACKAGE_UTIL_LINUX_LIBUUID
@@ -11,6 +11,6 @@ config BR2_PACKAGE_LIBKS
 
 	  https://github.com/signalwire/libks
 
-comment "libks needs a toolchain w/ C++, threads, dynamic library"
+comment "libks needs a toolchain w/ C++, NPTL, dynamic library"
 	depends on BR2_STATIC_LIBS || !BR2_INSTALL_LIBSTDCPP \
-		|| !BR2_TOOLCHAIN_HAS_THREADS
+		|| !BR2_TOOLCHAIN_HAS_THREADS_NPTL