Add recipe and patch for pyenet.

Note that due to the way that cython extensions are built, this actually
uses the enet sources. They are pulled in via a second source archive
and then symlinked into place for the pyenet build to pick them up.

dev-python/pyenet/patches/pyenet-20141025.patchset

@@ -0,0 +1,57 @@
+From 0d76ac64d30acd2a26ef8d662a3a00940ba98a57 Mon Sep 17 00:00:00 2001
+From: Michael Lotz <mmlr@mlotz.ch>
+Date: Sat, 24 Oct 2015 20:47:49 +0000
+Subject: [PATCH 1/2] Declare availability of get{addr|name}info(), link
+ libnetwork.
+
+---
+ setup.py | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 95d55e8..7a2642f 100644
+--- a/setup.py
++++ b/setup.py
+@@ -28,7 +28,11 @@ if sys.platform == 'win32':
+     define_macros.extend([('WIN32', None)])
+     libraries.extend(['ws2_32', 'Winmm'])
+ 
+-if sys.platform != 'darwin':
++if sys.platform == 'haiku1':
++    define_macros.extend([('HAS_GETADDRINFO', None), ('HAS_GETNAMEINFO', None)])
++    libraries.extend(['network'])
++
++elif sys.platform != 'darwin':
+     define_macros.extend([('HAS_GETHOSTBYNAME_R', None), ('HAS_GETHOSTBYADDR_R', None)])
+ 
+ ext_modules = [
+-- 
+2.2.2
+
+
+From 224a284bb15f6a06b41a6743fd33d9d94140fe77 Mon Sep 17 00:00:00 2001
+From: Michael Lotz <mmlr@mlotz.ch>
+Date: Sat, 24 Oct 2015 21:12:27 +0000
+Subject: [PATCH 2/2] Disable strict aliasing as the wrapper is not aliasing
+ clean.
+
+---
+ setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 7a2642f..9521285 100644
+--- a/setup.py
++++ b/setup.py
+@@ -38,7 +38,7 @@ elif sys.platform != 'darwin':
+ ext_modules = [
+     Extension(
+         "enet",
+-        extra_compile_args=["-O3"],
++        extra_compile_args=['-O3', '-fno-strict-aliasing'],
+         sources=source_files,
+         include_dirs=["enet/include/"],
+         define_macros=define_macros,
+-- 
+2.2.2
+