Fix offset tracker to build binaries for go stdlib as well #256
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The goal of this PR is to resolve the build issues with offset tracker #250 (comment)
In https://go-review.googlesource.com/c/go/+/475378 the DWARF symbols were removed from the release toolchain.
For finding the offsets of fields in the standard library, we download these binaries, however without DWARF, we can't analyze them.
To fix that, this PR builds a dummy app locally and uses it to find the offsets (same as done for libraries outside of the standard library)