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a3c20dffae
Updates the build runner to unconditionally require a zig lib directory parameter. This parameter is needed in order to correctly understand file system inputs from zig compiler subprocesses, since they will refer to "the zig lib directory", and the build runner needs to place file system watches on directories in there. The build runner's fanotify file watching implementation now accounts for when two or more Cache.Path instances compare unequal but ultimately refer to the same directory in the file system. Breaking change: std.Build no longer has a zig_lib_dir field. Instead, there is the Graph zig_lib_directory field, and individual Compile steps can still have their zig lib directories overridden. I think this is unlikely to break anyone's build in practice. The compiler now sends a "file_system_inputs" message to the build runner which shares the full set of files that were added to the cache system with the build system, so that the build runner can watch properly and redo the Compile step. This is implemented for whole cache mode but not yet for incremental cache mode.