The Linux arm64 build of Boost also uses the current v20_clang-13.0.1-centos7
toolchain rather than the old v19_clang-11.0.1-centos7 version.
#jira UE-148077
#rb brandon.schaefer
#preflight 631f6beda9331c69c3a3c541
[CL 21970754 by matt johnson in ue5-main branch]
The build script included here is largely a copy of the existing
build script for Mac, which was itself ported from the build script
for Windows, so its usage is similar.
The build products included here represent Boost version
1.70.0, the same version currently used on Windows and Mac.
Note that this does *not* include the update to the module rules
that would put this new set of libraries into use with engine builds.
That will be done in a subsequent change, since it will have to be
combined with a rebuild of USD, which is the main consumer of
the Boost libraries.
#rb michael.balzer
#preflight skip
[CL 19546691 by matt johnson in ue5-main branch]