tests: fix test 1167 to skip digit-only symbols #13634
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This avoids mistaking symbols with their numeric value when using
certain C preprocessors which output these numeric values at the
beginning of the line as part of an expression.
Seen on OpenBSD 7.5 + clang.
Example
test1167.pl -v
output, before this patch:Ref: https://github.com/curl/curl/actions/runs/9069136530/job/24918015357#step:3:7513
Ref: #13583
Closes #13634