c-ares: Fix for 64-bit build

packages/c-ares/ares_init.c.patch

@@ -0,0 +1,41 @@
+diff -u -r ../c-ares-1.10.0/ares_init.c ./ares_init.c
+--- ../c-ares-1.10.0/ares_init.c	2013-02-17 11:44:02.000000000 -0500
++++ ./ares_init.c	2016-01-03 08:28:33.855590585 -0500
+@@ -43,7 +43,36 @@
+ #endif
+ 
+ #if defined(ANDROID) || defined(__ANDROID__)
+-#include <sys/system_properties.h>
++
++# ifdef __LP64__
++# include <dlfcn.h>
++// http://stackoverflow.com/questions/28413530/api-to-get-android-system-properties-is-removed-in-arm64-platforms
++// Android 64-bit makes __system_property_get a non-global symbol.
++// Here we provide a stub which loads the symbol from libc via dlsym.
++#define PROP_NAME_MAX 31
++#define PROP_VALUE_MAX 91
++typedef int (*PFN_SYSTEM_PROP_GET)(const char *, char *);
++int __system_property_get(const char* name, char* value)
++{
++       static PFN_SYSTEM_PROP_GET __real_system_property_get = NULL;
++       if (!__real_system_property_get) {
++               // libc.so should already be open, get a handle to it.
++               void *handle = dlopen("libc.so", RTLD_NOLOAD);
++               if (!handle) {
++                       printf("Cannot dlopen libc.so: %s.\n", dlerror());
++               } else {
++                       __real_system_property_get = (PFN_SYSTEM_PROP_GET)dlsym(handle, "__system_property_get");
++               }
++               if (!__real_system_property_get) {
++                       printf("Cannot resolve __system_property_get(): %s.\n", dlerror());
++               }
++       }
++       return (*__real_system_property_get)(name, value);
++} 
++# else
++#  include <sys/system_properties.h>
++#endif
++
+ /* From the Bionic sources */
+ #define DNS_PROP_NAME_PREFIX  "net.dns"
+ #define MAX_DNS_PROPERTIES    8