Paul Gschwendtner 7d598801f0 fix(bazel): ng_package not generating UMD bundles on windows (#27200)
* Fixes that `ng_package` does not work generate UMD bundles on Windows because the `esm5/` files are not written to the output directory. This is because `rootDirs` and `rootDir` are posix paths and cause invalid relative paths when mixed with Windows backslash paths.

PR Close #27200
2018-12-04 14:01:24 -08:00
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