python-msgpack: remove useless 'depends on' in comment

In commit 6709fad224692ae5e0788bbd30145f7d622b52a4, python-msgpack was
bumped to a new version that has support for Python 3. The "depends on
BR2_PACKAGE_PYTHON' was removed for the main python-msgpack Config.in
option, but not from the comment. This commit fixes this
inconsistency.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-msgpack/Config.in

@@ -13,5 +13,4 @@ config BR2_PACKAGE_PYTHON_MSGPACK
 
 comment "python-msgpack needs a toolchain w/ C++"
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4
-	depends on BR2_PACKAGE_PYTHON
 	depends on !BR2_INSTALL_LIBSTDCPP