Bad paths of dependencies in `blockly_uncompressed` / `test/deps.js` under Windows

[seldomU]

blockly_uncompressed.js contains lines like this:

goog.addDependency('../../C:/myBlocklyPath/core/blocks.js', ['Blockly.Blocks'], [], {});

Which makes the playground unusable. Compressed builds work correctly. I believe this problem has been existing for a while.
The file was generated under windows 10 with gulp buildUncompressed on the master branch, commit from March 31, SHA 4be82c0

[seldomU]

Since the problem is internal to closure, I could only add a sort of band-aid in build_tasks.js buildUncompressed()

Before:

    const addDependency = closureDeps.depFile
        .getDepFileText(closurePath, deps)
        .replace(/\\/g, '\/');

After:

    const addDependency = closureDeps.depFile
        .getDepFileText(closurePath, deps)
        .replace(/\.\..*core/g, '../../core')
        .replace(/\\/g, '\/');

[cpcallen]

You should check if this issue still exists in the goog_module branch, which uses a new mechanism (closure-make-deps) to generate the dependency info, which is now written to test/deps.js instead of blockly_uncompressed.js; see #5019.

[cpcallen]

A commit in @himanshujaidka's PR #5407 has added lots of DOS file paths in test/deps.js, making it reasonably clear that this bug still exists in the revised dependency generation mechanism now used in goog_module.

I'm going to mark this for re-triage, since I think that not being able to update deps on Windows is not a great situation and might merit a slightly higher priority.