package/php: intl support needs icu, which needs threads

Fixes:
    http://autobuild.buildroot.net/results/156/1567be445b3ab9071717e9e72301818f95d0a143/

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/php/Config.ext

@@ -163,13 +163,14 @@ config BR2_PACKAGE_PHP_EXT_INTL
 	depends on BR2_USE_WCHAR
 	depends on !BR2_arc # icu -> atomic builtins
 	depends on !BR2_BINFMT_FLAT # icu
+	depends on BR2_TOOLCHAIN_HAS_THREADS # icu
 	help
 	  Internationalization support
 
-comment "intl support needs a toolchain w/ C++, wchar"
+comment "intl support needs a toolchain w/ C++, wchar, threads"
 	depends on !BR2_arc
 	depends on !BR2_BINFMT_FLAT
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
 
 comment "Image processing"