title: API to get android system properties is removed in arm64 platforms
body: <p>I am using __system_property_get() from sys/system_properties.h to get a system property. I am trying to use r10c ndk because I need arm64 toolchain. </p>
  
  <p>__system_property_get() is defined in libc.so. Below is the readelf output of libc.so for armv5/armv7a.</p>
  
  <pre><code>readelf -Ws libc.so | grep property_get
  
         194: 00009100    20 FUNC    GLOBAL DEFAULT    4 __system_property_get
         198: 00009100    20 FUNC    GLOBAL DEFAULT    4 __system_property_get
  </code></pre>
  
  <p>But, looks like it has been removed for arm64 version! I am getting a linker error saying it is not defined. I analyzed all the shared libraries of arm64 but none of them have that symbol.</p>
  
  <p>Is there an alternate API to get the system property in the native code?</p>
  
  <p>Thank you!</p>