package/libnfc: drop leftover comment

In commit 1a49188a694 (package/libnfc: add sub-options to enable
individual drivers), the dependency on threads was moved down to
the individual drivers that need it, and libnfc as a whole lost
that dependency.

However, the global comment was not removed. Do so now.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libnfc/Config.in

@@ -75,6 +75,3 @@ config BR2_PACKAGE_LIBNFC_EXAMPLES
 	select BR2_PACKAGE_READLINE
 
 endif
-
-comment "libnfc needs a toolchain w/ threads"
-	depends on !BR2_TOOLCHAIN_HAS_THREADS