Add Android items from "sys/system_properties.h":

 * __system_property_set
 * __system_property_get
 * PROP_VALUE_MAX

Author: GuillaumeGomez

src/unix/linux_like/android/mod.rs

@@ -2285,6 +2285,9 @@ pub const AF_VSOCK: ::c_int = 40;
 pub const PF_NFC: ::c_int = AF_NFC;
 pub const PF_VSOCK: ::c_int = AF_VSOCK;
 
+// sys/system_properties.h
+pub const PROP_VALUE_MAX: ::c_int = 92;
+
 f! {
     pub fn CMSG_NXTHDR(mhdr: *const msghdr,
                        cmsg: *const cmsghdr) -> *mut cmsghdr {
@@ -2709,6 +2712,9 @@ extern "C" {
     pub fn android_set_abort_message(msg: *const ::c_char);
 
     pub fn gettid() -> ::pid_t;
+
+    pub fn __system_property_set(__name: *const ::c_char, __value: *const ::c_char) -> ::c_int;
+    pub fn __system_property_get(__name: *const ::c_char, __value: *mut ::c_char) -> ::c_int;
 }
 
 cfg_if! {