dev-python/requests: remove unused patch

Closes: https://github.com/gentoo/gentoo/pull/2362

Signed-off-by: David Seifert <soap@gentoo.org>

dev-python/requests/files/requests-2.4.0-system-cacerts.patch

@@ -1,14 +0,0 @@
-diff -ur requests-2.4.0.orig/requests/certs.py requests-2.4.0/requests/certs.py
---- requests/certs.py	2014-08-20 00:52:58.000000000 +0800
-+++ requests/certs.py	2014-09-09 14:17:33.237264068 +0800
-@@ -18,6 +18,10 @@
- except ImportError:
-     def where():
-         """Return the preferred certificate bundle."""
-+        cacerts = '/etc/ssl/certs/ca-certificates.crt'
-+        if os.path.exists(cacerts):
-+            return cacerts
-+
-         # vendored bundle inside Requests
-         return os.path.join(os.path.dirname(__file__), 'cacert.pem')
-