Add missing constant MAP_32BIT on x86_64-linux-android and i686-linux-android

Author: roblabla

src/unix/notbsd/android/b32/x86.rs

@@ -4,3 +4,5 @@ pub type wchar_t = i32;
 pub const O_DIRECT: ::c_int = 0x4000;
 pub const O_DIRECTORY: ::c_int = 0x10000;
 pub const O_NOFOLLOW: ::c_int = 0x20000;
+
+pub const MAP_32BIT: ::c_int = 0x40;

src/unix/notbsd/android/b64/x86_64.rs

@@ -51,3 +51,5 @@ pub const SYS_gettid: ::c_long = 186;
 
 pub const SIGSTKSZ: ::size_t = 8192;
 pub const MINSIGSTKSZ: ::size_t = 2048;
+
+pub const MAP_32BIT: ::c_int = 0x40;