some API work on std.c, std.os, std.os.wasi

* std.c: consolidate some definitions, making them share code. For
  example, freebsd, dragonfly, and openbsd can all share the same
  `pthread_mutex_t` definition.
* add type safety to std.c.O
  - this caught a bug where mode flags were incorrectly passed as the
    open flags.
* 3 fewer uses of usingnamespace keyword
* as per convention, remove purposeless field prefixes from struct field
  names even if they have those prefixes in the corresponding C code.
* fix incorrect wasi libc Stat definition
* remove C definitions from incorrectly being in std.os.wasi
* make std.os.wasi definitions type safe
* go through wasi native APIs even when linking libc because the libc
  APIs are problematic and wasteful
* don't expose WASI definitions in std.posix
* remove std.os.wasi.rights_t.ALL: this is a footgun. should it be all
  future rights too? or only all current rights known? both are
  the wrong answer.

1 files changed, 0 insertions, 23 deletions

diff --git a/lib/std/os/linux/riscv64.zig b/lib/std/os/linux/riscv64.zig
index 45821ddefa..c23fc5e4df 100644
--- a/lib/std/os/linux/riscv64.zig
+++ b/lib/std/os/linux/riscv64.zig
@@ -110,29 +110,6 @@ pub fn restore_rt() callconv(.Naked) noreturn {
     );
 }
 
-pub const O = struct {
-    pub const CREAT = 0o100;
-    pub const EXCL = 0o200;
-    pub const NOCTTY = 0o400;
-    pub const TRUNC = 0o1000;
-    pub const APPEND = 0o2000;
-    pub const NONBLOCK = 0o4000;
-    pub const DSYNC = 0o10000;
-    pub const SYNC = 0o4010000;
-    pub const RSYNC = 0o4010000;
-    pub const DIRECTORY = 0o200000;
-    pub const NOFOLLOW = 0o400000;
-    pub const CLOEXEC = 0o2000000;
-
-    pub const ASYNC = 0o20000;
-    pub const DIRECT = 0o40000;
-    pub const LARGEFILE = 0o100000;
-    pub const NOATIME = 0o1000000;
-    pub const PATH = 0o10000000;
-    pub const TMPFILE = 0o20200000;
-    pub const NDELAY = NONBLOCK;
-};
-
 pub const F = struct {
     pub const DUPFD = 0;
     pub const GETFD = 1;