[Chapel Merge] Change a case of applying -eq to string arguments

Branch: refs/heads/master
Revision: 9702cc9
Author: bradcray
Log Message:

Merge pull request #17876 from bradcray/fix-eq-vs-==

Change a case of applying -eq to string arguments to == (fixes #17851)

[reviewed by @mppf]

This adjusts an -eq vs. == error that I introduced in #17851, where I wanted to compare strings, so should've used the latter. While this didn't cause problems in my/our testing, @mppf saw failures with SLES12 in which it got into a conditional that should've been darwin-specific.

Modified Files:
M util/config/gather-clang-sysroot-arguments

Compare: https://github.com/chapel-lang/chapel/compare/6494765d808d...9702cc9e3ba0