Reverted commits that deprecated the build.zig files, and added a note to all of them stating version of zig they were using (#3060)

* Revert "Fixed broken build.zig files. Now works with latest stable compiler (as of commit, latest is 0.10.1) (#3045)"

This reverts commit de748dfffe so that zig
build script works with master branch of zig.

* Added a note to build.zig files that denotes what version of zig they have been tested with.

* Standardised the note in the build.zig files

examples/build.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 const builtin = @import("builtin");
 
+// This has been tested to work with zig master branch as of commit 87de821 or May 14 2023
 fn add_module(comptime module: []const u8, b: *std.Build, target: std.zig.CrossTarget, optimize: std.builtin.OptimizeMode) !*std.Build.Step {
     if (target.getOsTag() == .emscripten) {
         @panic("Emscripten building via Zig unsupported");