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CMakeDetermineCompilerABI: avoid removing the flag after -Werror

Raul Tambre requested to merge tambre/cmake:werror_space_fix into master

The matching became too eager after !5318 (merged).
When -Werror was specified without a value we would eat the following flag.
Prevent this by disallowing "-" as the first character of the flag's value.

Fixes: !5318 (merged)
See-also: https://discourse.cmake.org/t/8230
Backport: release

Edited by Brad King

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