package/uftrace: add missing dependency to comment

Commit f06d79255fbf0607200f1cc50a5dd87839295be3 forgot to add
BR2_PACKAGE_UFTRACE_ARCH_SUPPORTS dependency to threads comment

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

package/uftrace/Config.in

@@ -23,4 +23,5 @@ config BR2_PACKAGE_UFTRACE
 	  https://github.com/namhyung/uftrace
 
 comment "uftrace needs a toolchain w/ threads"
+	depends on BR2_PACKAGE_UFTRACE_ARCH_SUPPORTS
 	depends on !BR2_TOOLCHAIN_HAS_THREADS