Update zig build system to zig version 0.11.0

[purple4pur]

Discard build.zig and use src/build.zig only, bc by default these two output in different directories.

build command: cd to src then zig build.

Close #3386

[raysan5]

@purple4pur thanks for the review!

[Not-Nik]

Unfortunately, removing the top-level build.zig wrecks compatibility with Zig's builtin package manager

[star-tek-mb]

Yeah. Revert PR please. Latest raylib is up to date with latest zig. Feel free to find commit version which suites your zig version. You are sending patch to master branch while you were using raylib 4.5.0.

[raysan5]

@Not-Nik @star-tek-mb should this PR be reverted?

[purple4pur]

@Not-Nik Ohh thanks for this infomation!

@star-tek-mb Tested with master branch raylib and zig 0.11.0, build.zig and src/build.zig are ready to go, but examples/build.zig fails (same as #3386), which is this PR mainly about.

Let me do more checks on both latest master branches and zig's package manager

[star-tek-mb]

Ok. Thanks. I was mainly arguing with top level build.zig. I need it in my projects.

Sorry for maybe my rude messages. Let me know if you need any help with examples. I will check on zig master later.

[purple4pur]

@star-tek-mb nvm, your suggestion helps a lot! Also I tested with latest zig 0.12.0-dev.817+54e7f58fc, updating examples/build.zig is still needed

@Not-Nik @star-tek-mb I checked zig's package manager and tried the demo ziglang/zig#14265, top-level build.zig seems necessary. At the point before this PR, confusing problems are:

1. Running zig build at top-level gets zig-out at top-level (which is expected). Running zig build in src gets errors complaining at

   raylib/src/build.zig

   Lines 195 to 197 in cfffa74

   	lib.installHeader("src/raylib.h", "raylib.h");
   	lib.installHeader("src/raymath.h", "raymath.h");
   	lib.installHeader("src/rlgl.h", "rlgl.h");

   error: unable to update file from 'raylib\src\src\raylib.h' to 'raylib\src\zig-out\include\raylib.h': FileNotFound
2. If fix above lines then top-level complains.
3. examples/build.zig uses src/zig-out not zig-out

   raylib/examples/build.zig

   Lines 30 to 33 in cfffa74

   	.windows => "../src/zig-out/lib/raylib.lib",
   	.linux => "../src/zig-out/lib/libraylib.a",
   	.macos => "../src/zig-out/lib/libraylib.a",
   	.emscripten => "../src/zig-out/lib/libraylib.a",

So my ideas:

• Option 1: fix src/build.zig to 1. have no conflict with top-level build.zig and 2. always output zig-out to top-level
• Option 2: keep only one build.zig at top-level, discard src/build.zig
• Option 3: keep them there, but add a note to src/build.zig, which reminds users not to build in src

I've tried Option 1 before this PR, but still don't solve :(
Any suggestions?

[Not-Nik]

Also I tested with latest zig 0.12.0-dev.817+54e7f58fc, updating examples/build.zig is still needed

I strongly oppose updating Zig to a pre-release version.

As for the build.zig positions, I don't think any changes are necessary from the version before this PR.

[purple4pur]

OK. I then open a PR that just focuses on examples/build.zig with zig 0.11.0.

Much appreciated @Not-Nik !