build: remove scripts in the tools dir that are unused

[MarshallOfSound]

I'm cleaning up the tools and scripts folder, looks like most of the stuff in tools was from the GYP days or sometimes even earlier, no need to keep it around anymore

Part 1 of N

Notes: no-notes

[codebytere]

before we ditch these, do we know where they were all used at one point in time so we can be sure we don't need them anymore?

[MarshallOfSound]

@codebytere Yeah I traced them all to be sure, I'll put a quick list below.

• atom_source_root.js used in GYP bootstrap for < 1.8
• dump-version-info.js replaced by metadumper
• get-endianess used in ancient GYP bootstrap
• pkg-config-wrapper used in GYP sysroot land
• rewrite_dirs used in GYP sysroot land
• sysroot_ld_paths more GYP sysroot stuff
• make_locale_paks used in GYP building days, GN / chromium build scripts does this for us now
• run-electron yeah idk, back in GYP days, it points back to out/D which is a GYP thing

[release-clerk]

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