aix: add more dlopen flags

(backport <rust-lang#4044>)
(cherry picked from commit 17a88cc)

Author: mustartt

src/unix/aix/mod.rs

@@ -708,6 +708,8 @@ pub const RTLD_LAZY: ::c_int = 0x4;
 pub const RTLD_NOW: ::c_int = 0x2;
 pub const RTLD_GLOBAL: ::c_int = 0x10000;
 pub const RTLD_LOCAL: ::c_int = 0x80000;
+pub const RTLD_MEMBER: ::c_int = 0x40000;
+pub const RTLD_NOAUTODEFER: ::c_int = 0x20000;
 pub const RTLD_DEFAULT: *mut ::c_void = -1isize as *mut ::c_void;
 pub const RTLD_MYSELF: *mut ::c_void = -2isize as *mut ::c_void;
 pub const RTLD_NEXT: *mut ::c_void = -3isize as *mut ::c_void;