package/python-treq: fix dependencies

python-treq needs TLS support in twisted so select
BR2_PACKAGE_PYTHON_TWISTED_TLS moreover it doesn't depend directly on
service_identity and pyOpenSSL since version 17.3.0 and
https://github.com/twisted/treq/commit/ef2ac7ea2b74774adb9fef7675facc6017bfda89

Finally, python-idna was never a direct dependency of python-treq

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/python-treq/Config.in

@@ -1,16 +1,13 @@
 config BR2_PACKAGE_PYTHON_TREQ
 	bool "python-treq"
-	# python-pyopenssl -> python-cryptography
+	# twisted TLS -> python-{pyopenssl,service-identity}
 	depends on BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS
-	# python-idna, python-pyopenssl -> python-cryptography
 	select BR2_PACKAGE_PYTHON_ATTRS # runtime
-	select BR2_PACKAGE_PYTHON_IDNA # runtime
 	select BR2_PACKAGE_PYTHON_INCREMENTAL # runtime
-	select BR2_PACKAGE_PYTHON_PYOPENSSL # runtime
 	select BR2_PACKAGE_PYTHON_REQUESTS # runtime
-	select BR2_PACKAGE_PYTHON_SERVICE_IDENTITY # runtime
 	select BR2_PACKAGE_PYTHON_SIX # runtime
 	select BR2_PACKAGE_PYTHON_TWISTED # runtime
+	select BR2_PACKAGE_PYTHON_TWISTED_TLS # runtime
 	help
 	  treq is an HTTP library inspired by requests but written on
 	  top of Twisted's Agents. It provides a simple, higher level