arm64 build fix for net/poco

Pretty straight forward, let this port build on arm64.

(btw, it looks like the project is hosted on github now, they have newer
releases than what we have in the tree)

OK?


Index: net/poco/patches/patch-Foundation_include_Poco_Platform_h
===================================================================
RCS file: net/poco/patches/patch-Foundation_include_Poco_Platform_h
diff -N net/poco/patches/patch-Foundation_include_Poco_Platform_h
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ net/poco/patches/patch-Foundation_include_Poco_Platform_h 26 Sep 2017 21:25:28 -0000
@@ -0,0 +1,23 @@
+$OpenBSD$
+
+Index: Foundation/include/Poco/Platform.h
+--- Foundation/include/Poco/Platform.h.orig
++++ Foundation/include/Poco/Platform.h
+@@ -145,6 +145,7 @@
+ #define POCO_ARCH_S390 0x0c
+ #define POCO_ARCH_SH 0x0d
+ #define POCO_ARCH_NIOS2 0x0e
++#define POCO_ARCH_AARCH64 0x0f
+
+
+ #if defined(__ALPHA) || defined(__alpha) || defined(__alpha__) || defined(_M_ALPHA)
+@@ -187,6 +188,9 @@
+ #else
+ #define POCO_ARCH_LITTLE_ENDIAN 1
+