Download Boost 1.78.0 from jfrog.io
Download Boost 1.78.0 from jfrog.io

https://iweb.dl.sourceforge.net/ is no longer available.

Update to the URL and version currently advertised at
https://www.boost.org/users/download/.

Bug: Fix building with REACTOR_EMIT_DEBUG_INFO
Change-Id: I0d9560b5238c74ca41b425f5703bf23c79835d79
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/61388
Kokoro-Result: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Tested-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Reviewed-by: Alexis Hétu <1c7141772178a7e80858c3db5052b328076f08f4@google.com>

google/swiftshader,google/swiftshader,google/swiftshader