Auto merge of #2506 - hhyhhy:master, r=Amanieu

add SO_*_FILTER for Android

Those constants are used by https://github.com/rust-lang/socket2

From: https://android.googlesource.com/platform/prebuilts/ndk/+/dev/platform/sysroot/usr/include/asm-generic/socket.h

See also: https://www.kernel.org/doc/html/v5.12/networking/filter.html

Author: bors

src/unix/linux_like/android/mod.rs

@@ -1202,6 +1202,9 @@ pub const SO_SNDLOWAT: ::c_int = 19;
 pub const SO_RCVTIMEO: ::c_int = 20;
 pub const SO_SNDTIMEO: ::c_int = 21;
 pub const SO_BINDTODEVICE: ::c_int = 25;
+pub const SO_ATTACH_FILTER: ::c_int = 26;
+pub const SO_DETACH_FILTER: ::c_int = 27;
+pub const SO_GET_FILTER: ::c_int = SO_ATTACH_FILTER;
 pub const SO_TIMESTAMP: ::c_int = 29;
 pub const SO_ACCEPTCONN: ::c_int = 30;
 pub const SO_PEERSEC: ::c_int = 31;