path arguments to zig build are inconsistent in whether they are relative to build root, such as --zig-lib-dir

Here we collect zig lib dir from the user:

Lines 3769 to 3770 in 75d5a4b

    
           override_lib_dir = args[i]; 
        
           try child_argv.appendSlice(&[_][]const u8{ arg, args[i] });

It is then used relative to the cwd in order to build the build runner. Next, it is passed to the build runner and then the build runner interprets the file path as being relative to build.zig.

It can't be both ways; it needs to be consistently one way.

This results in nonsense experiences such as this:

$ stage3/bin/zig build  --zig-lib-dir ../lib
error: unable to open zig lib directory from 'zig-lib-dir' argument or env, '/home/andy/dev/lib': FileNotFound
$ stage3/bin/zig build  --zig-lib-dir lib
error: unable to open zig lib directory from 'zig-lib-dir' argument: 'lib': FileNotFound

As a workaround until this issue is fixed an absolute path can be used:

$ stage3/bin/zig build  --zig-lib-dir $(pwd)/../lib
(ok)

CI: use absolute path for zig lib dir

CI: windows: fix zig lib dir path

Fixes ziglang#12685.

build system: follow-up enhancements regarding LazyPath

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path arguments to `zig build` are inconsistent in whether they are relative to build root, such as --zig-lib-dir #12685

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	override_lib_dir = args[i];
	try child_argv.appendSlice(&[_][]const u8{ arg, args[i] });

path arguments to zig build are inconsistent in whether they are relative to build root, such as --zig-lib-dir #12685

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path arguments to `zig build` are inconsistent in whether they are relative to build root, such as --zig-lib-dir #12685