Delete evutil_rand.c.patch

It's not needed in 2.1.11, since this version checks for arc4random_addrandom in upstream.

packages/libevent/evutil_rand.c.patch

@@ -1,14 +0,0 @@
-diff -u -r ../libevent-release-2.1.8-stable/evutil_rand.c ./evutil_rand.c
---- ../libevent-release-2.1.8-stable/evutil_rand.c	2017-01-26 00:37:15.000000000 +0100
-+++ ./evutil_rand.c	2017-01-27 23:51:13.124764486 +0100
-@@ -195,8 +195,10 @@
- void
- evutil_secure_rng_add_bytes(const char *buf, size_t n)
- {
-+#ifndef __ANDROID__
- 	arc4random_addrandom((unsigned char*)buf,
- 	    n>(size_t)INT_MAX ? INT_MAX : (int)n);
-+#endif
- }
- 
- void