more haiku support

[hoanga]

Hello and happy halloween!

I was able to finally get some time to sit down and do some more continued work on improving Haiku support for Zig. The following changesets should allow

zig build in a (simple) zig project works

Running make install to install Zig after compiling probably doesn't work and is on the list of things todo. Debug still remains on the open list of items to tackle at some point but wanted to attempt with smaller changesets. Also included in the changes are some better error checking for some syscalls to Haiku and an attempted cleanup of some defines and constants in the Haiku support section that came across from an older copy and paste.

Getting Zig to compile on Haiku also meant using the current used version of LLVM (13) which is currently a (hopefully) pending port for Haiku. I am attaching some patches that I used to get LLVM to build on Haiku as well for reference but not including it in the PR changesets directly.

Sample Runs

~/src/git/zig/build> uname -a
Haiku shredder 1 hrev55602 Oct 29 2021 07:10:38 x86_64 x86_64 Haiku

~/src/git/zig/build> ./zig version
0.9.0-dev.1463+d97928bf5

## compiling with  simple program
~/src/git/zig/build> cd hellohaiku

~/src/git/zig/build/hellohaiku> cat src/main.zig 
const std = @import("std");
const thread = std.Thread;

pub fn main() anyerror!void {
    std.log.info("All your codebase are belong to us.", .{});
    std.log.info("Num CPUs: {d}.", .{thread.getCpuCount()});
}

~/src/git/zig/build/hellohaiku> ../zig build run
info: All your codebase are belong to us.
info: Num CPUs: 16.


### try using zig build on some other zig codebases

~/src/git/zig/build/ziglings> ../zig build 8
Compiling 008_quiz.zig...
Checking 008_quiz.zig...
PASSED: Program in Zig!


~/src/git/zig/build/ziglings> ../zig build 31
Compiling 031_switch2.zig...
Checking 031_switch2.zig...
PASSED: ZIG!!

[hoanga]

patches applied to (zig-bootstrap) LLVM
llvm13-diff.patch.zip

[andrewrk]

CI is failing on zig fmt

[andrewrk]

CC @waddlesplash who gave me permission on IRC to ask for help reviewing :-)

[hoanga]

oops, sorry about the fmt miss. i have gone through and double checked that all files that have been changed have had fmt applied to them and pushed updates, hopefully CI will find that more agreeable.

[waddlesplash]

These constants, also, do not seem to properly correspond to ours. They should probably all be fixed. (I think a lot of the constants not touched in these commits have similar problems, maybe a general review of the constants in this file is in order.)

[hoanga]

see above

[hoanga]

updated

[andrewrk]

Let's please correct all the constants in this PR, and delete any constants that have not been audited. I don't want any incorrect haiku constants in the zig standard library. Let me know when that's done and I'll look into merging the PR.

[hoanga]

thank you for the feedback. when i get some time (hopefully this weekend), i will try to look over the constants and get some updates in.

[hoanga]

have went through and cleaned up as many of the constants so they should match the haiku definitions that i could find. i think it is ready for review (assuming the build is okay with it too)

[andrewrk]

Thanks @hoanga!