Fix value of SYS_syscalls

Author: gnzlbg

src/unix/notbsd/android/b64/aarch64.rs

@@ -322,4 +322,4 @@ pub const SYS_pwritev2: ::c_long = 287;
 pub const SYS_pkey_mprotect: ::c_long = 288;
 pub const SYS_pkey_alloc: ::c_long = 289;
 pub const SYS_pkey_free: ::c_long = 290;
-pub const SYS_syscalls: ::c_long = 291;
+pub const SYS_syscalls: ::c_long = 292;