Patch libevent when building for Android (fix arc4random_addrandom)

depends/packages/libevent.mk

@@ -3,10 +3,17 @@ $(package)_version=2.1.8-stable
 $(package)_download_path=https://github.com/libevent/libevent/archive/
 $(package)_file_name=release-$($(package)_version).tar.gz
 $(package)_sha256_hash=316ddb401745ac5d222d7c529ef1eada12f58f6376a66c1118eee803cb70f83d
+$(package)_patches=fix_android_arc4random_addrandom.patch
 
-define $(package)_preprocess_cmds
-  ./autogen.sh
-endef
+ifneq (,$(findstring android,$(host)))
+  define $(package)_preprocess_cmds
+    ./autogen.sh && patch -p1 < $($(package)_patch_dir)/fix_android_arc4random_addrandom.patch
+  endef
+else
+  define $(package)_preprocess_cmds
+    ./autogen.sh
+  endef
+endif
 
 define $(package)_set_vars
   $(package)_config_opts=--disable-shared --disable-openssl --disable-libevent-regress --disable-samples