package/python-pysftp: fix dependencies

Fix the following build failure raised since bump of python-cryptography
to version 36.0.1 in commit 01764876e3d4e7ab95c8365f1c83e6c12d49757c:

WARNING: unmet direct dependencies detected for BR2_PACKAGE_PYTHON_PARAMIKO
  Depends on [n]: (BR2_PACKAGE_PYTHON [=n] || BR2_PACKAGE_PYTHON3 [=y]) && BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS [=n] && BR2_PACKAGE_PYTHON3 [=y]
  Selected by [y]:
  - BR2_PACKAGE_PYTHON_PYSFTP [=y] && (BR2_PACKAGE_PYTHON [=n] || BR2_PACKAGE_PYTHON3 [=y]) && BR2_PACKAGE_PYTHON3 [=y] && BR2_INSTALL_LIBSTDCPP [=y]

WARNING: unmet direct dependencies detected for BR2_PACKAGE_PYTHON_PARAMIKO
  Depends on [n]: (BR2_PACKAGE_PYTHON [=n] || BR2_PACKAGE_PYTHON3 [=y]) && BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS [=n] && BR2_PACKAGE_PYTHON3 [=y]
  Selected by [y]:
  - BR2_PACKAGE_PYTHON_PYSFTP [=y] && (BR2_PACKAGE_PYTHON [=n] || BR2_PACKAGE_PYTHON3 [=y]) && BR2_PACKAGE_PYTHON3 [=y] && BR2_INSTALL_LIBSTDCPP [=y]

Fixes:
 - No autobuilder failures (yet)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/python-pysftp/Config.in

@@ -1,13 +1,9 @@
 config BR2_PACKAGE_PYTHON_PYSFTP
 	bool "python-pysftp"
+	depends on BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS # python-paramiko -> python-cryptography
 	depends on BR2_PACKAGE_PYTHON3 # python-paramiko -> python-bcrypt
-	depends on BR2_INSTALL_LIBSTDCPP # python-paramiko
 	select BR2_PACKAGE_PYTHON_PARAMIKO # runtime
 	help
 	  A friendly face on SFTP.
 
 	  https://bitbucket.org/dundeemt/pysftp
-
-comment "python-pysftp needs a toolchain w/ C++"
-	depends on BR2_PACKAGE_PYTHON3
-	depends on !BR2_INSTALL_LIBSTDCPP