[Chapel Merge] Bump host gcc version to 10.2.0.

Branch: refs/heads/1.23-for-EX
Revision: e1f0860
Author: gbtitus
Log Message:

Merge pull request #16833 from gbtitus/use-host-gcc-10.2.0

Bump host gcc version to 10.2.0.

(Reviewed by @mppf.)

When we build our bundled LLVM, we use the host gcc compiler version to
configure where the clang included therein tries to find gcc-related
libraries to link with eventual user programs. We’ve been using gcc
10.1.0 as our host compiler for the EX module builds. Unfortunately,
gcc 10.1.0 isn’t installed on the EX systems. The earliest gcc on them
is 10.2.0. As a result, Chapel --llvm compiles get a link-time error
because they can’t find certain gcc-related files, notably crtbegin.o
and crtend.o. This dependence between target and host configurations
seems like a problem, but it’s not clear what it will take to fix it.
So here, work around the issue for now by bumping the host gcc version
to 10.2.0, which does exist on the target. (Note that this version bump
would have been needed if we started building the EX module natively on
EX systems anyway, because again, 10.2.0 is the earliest gcc there.)

This resolves Cray/chapel-private#1520.

Modified Files:
M util/build_configs/cray-internal/setenv-hpe-cray-ex-x86_64.bash

Compare: https://github.com/chapel-lang/chapel/compare/57691cb4c072...e1f086042731