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Also a stepping stone in getting deps from .rc files correct automatically.

The driver script rc.py works like rc.exe; it supports printing resource
names on /showIncludes:

$ cat test.rc
4 ICON "icon.ico"
$ build/toolchain/win/rc/rc.py /showIncludes test.rc
Note: including file: ./foo.h
Note: including file: /Users/thakis/src/chrome/src/icon.ico
$ file test.res
test.res: MSVC .res

The driver script behind the scenes calls a deps'd-in "rc" binary.
This CL includes a script to build new versions of that binary.
It's ~150kB on Mac and Linux, and ~600kb on Windows.

The compiler isn't hooked up to anything yet. I plan to change
tool_wrapper.py to call both it and rc.exe in ExecRcWrapper() when
on Windows (and compare the two outputs and make sure they're identical),
and to call only rc.py when on non-Windows.

Eventually I also want to make ExecRcWrapper() use rc.py's /showIncludes
to get dependencies for .rc files right.

The README.md has some more details. We're in the process of slowly
upstreaming this to LLVM, but it looks like that'll take a while longer,
so in the meantime let's do this until the LLVM version is ready.

Bug: 774193,132660
Change-Id: I9a9ee1e271bf403ddb7f8d18ecd97730762c6cbc
Reviewed-on: https://chromium-review.googlesource.com/727110
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510244}