linux: gnu/musl: MAP_32BIT is only defined on x86

The Linux kernel only defines MAP_32BIT in the asm/mman.h header
on x86. Remove the erraneous definitions for any other architectures
on Linux targets.

See https://github.com/torvalds/linux/blob/master/arch/x86/include/uapi/asm/mman.h#L5

This makes libc-test somewhat compile on powerpc64le musl.

Signed-off-by: Jens Reidel <[email protected]>

Author: Gelbpunkt

src/unix/linux_like/linux/gnu/b32/m68k/mod.rs

@@ -191,7 +191,6 @@ pub const O_NDELAY: c_int = 0x800;
 pub const MADV_SOFT_OFFLINE: c_int = 101;
 pub const MAP_LOCKED: c_int = 0x02000;
 pub const MAP_NORESERVE: c_int = 0x04000;
-pub const MAP_32BIT: c_int = 0x0040;
 pub const MAP_ANON: c_int = 0x0020;
 pub const MAP_ANONYMOUS: c_int = 0x0020;
 pub const MAP_DENYWRITE: c_int = 0x0800;

src/unix/linux_like/linux/musl/b64/powerpc64.rs

@@ -72,6 +72,7 @@ s! {
 }
 
 pub const MADV_SOFT_OFFLINE: c_int = 101;
+#[deprecated = "Linux does not define MAP_32BIT on any architectures other than x86 and x86_64, this constant will be removed in the future"]
 pub const MAP_32BIT: c_int = 0x0040;
 pub const O_APPEND: c_int = 1024;
 pub const O_DIRECT: c_int = 0x20000;

src/unix/linux_like/linux/musl/b64/wasm32/mod.rs

@@ -441,7 +441,6 @@ pub const SYS_set_mempolicy_home_node: c_long = 450;
 pub const SYS_fadvise: c_long = SYS_fadvise64;
 
 pub const MADV_SOFT_OFFLINE: c_int = 101;
-pub const MAP_32BIT: c_int = 0x0040;
 pub const O_APPEND: c_int = 1024;
 pub const O_DIRECT: c_int = 0x4000;
 pub const O_DIRECTORY: c_int = 0x10000;