install-deps: fix centos 8's use of gcc-toolset-11

[cbodley]

removed steps to install the centos-release-scl packages. this was accidentally resurrected in 65b1a13

updated the gcc version detection and error message to reflect the gcc-toolset-11 packages installed from ceph.spec.in:

Your GCC is too old. Please run following command to add DTS to your environment:

scl enable gcc-toolset-11 bash

Or add following line to the end of ~/.bashrc to add it permanently:

source scl_source enable gcc-toolset-11

Fixes: https://tracker.ceph.com/issues/57073

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[ljflores]

install-deps.sh completes for me now!

I am seeing another issue now though, after installing dependencies and rerunning ./do_cmake.sh:

-- Performing Test HAVE_LIBATOMIC - Failed
CMake Error at cmake/modules/CheckCxxAtomic.cmake:66 (message):
  Host compiler /opt/rh/gcc-toolset-11/root/usr/bin/g++ requires libatomic,
  but it is not found
Call Stack (most recent call first):
  CMakeLists.txt:146 (include)


-- Configuring incomplete, errors occurred!
See also "/home/lflores/ceph/build/CMakeFiles/CMakeOutput.log".
See also "/home/lflores/ceph/build/CMakeFiles/CMakeError.log".
+ exit 1

Previously, I ran into this error message and fixed it by manually installing libatomic (I currently have libatomic-8.5.0-15.el8.x86_64 installed), but we may need a higher version now to get cmake to work.

Edit: Fixed it by installing gcc-toolset-11-libatomic-devel.

[ljflores]

Confirmed that I have gotten this to compile! The main thing that needs to be added is gcc-toolset-11-libatomic-devel. And I had a suggestion to make the warning message clearer for developers.

[cbodley]

The main thing that needs to be added is gcc-toolset-11-libatomic-devel.

odd, i do see that package named by ceph.spec.in, but its conditional on aarch64: https://github.com/ceph/ceph/blob/0c3f63f9/ceph.spec.in#L212-L214

on x86_64 i'm able to run cmake to completion without that packaged installed

edit: oops, after scl enable i do see that cmake failure

[tchaikov]

@ljflores @markhpc hi Laura and Mark, i am merging this changeset without your blessings, as it should decrease the chaos level caused by the C++20 and <=> changes.

[ljflores]

@tchaikov I didn't test it after Casey pushed new changes, but it worked for me initially. @markhpc let us know if you see anything off.