libcpprestsdk: require nptl threads

pthread_condattr_setclock is used which is NPTL only.

Fixes:
http://autobuild.buildroot.net/results/abf058948c9e4e9a50d42a05689b76bfb54a02e2/

Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libcpprestsdk/Config.in

@@ -1,9 +1,9 @@
 config BR2_PACKAGE_LIBCPPRESTSDK
 	bool "libcpprestsdk"
 	depends on BR2_INSTALL_LIBSTDCPP
-	depends on BR2_TOOLCHAIN_HAS_THREADS # boost
 	depends on BR2_USE_WCHAR # boost
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # exception_ptr
+	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL
 	select BR2_PACKAGE_BOOST
 	select BR2_PACKAGE_BOOST_ATOMIC
 	select BR2_PACKAGE_BOOST_CHRONO
@@ -22,9 +22,10 @@ config BR2_PACKAGE_LIBCPPRESTSDK
 
 	  https://github.com/Microsoft/cpprestsdk
 
-comment "libcpprestsdk needs a toolchain w/ C++, wchar, threads"
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
-		|| !BR2_USE_WCHAR
+comment "libcpprestsdk needs a toolchain w/ NPTL, C++, wchar"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL || \
+		!BR2_INSTALL_LIBSTDCPP || \
+		!BR2_USE_WCHAR
 
 comment "libcpprestsdk needs exception_ptr"
 	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735