tidy-up: fix Perl syntax and formatting nits

[vszakats]

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https://github.com/curl/curl/pull/22376/files?w=1

[Copilot]

Pull request overview

This PR tidies up a set of Perl scripts across the curl test suite, build helpers, and documentation tooling by addressing Perl syntax/formatting nits and moving several file opens toward the safer/more explicit 3-argument open(...) style.

Changes:

• Convert multiple open call sites from 2-arg forms like open FH, "<$file" / open(FH, ">$file") to 3-arg open(FH, "<", $file) / open(FH, ">", $file).
• Apply consistent spacing/formatting in argument lists and for(...) loops.
• Minor tuple/argument formatting cleanups in a few helper modules.

Reviewed changes

Copilot reviewed 19 out of 30 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/testutil.pm	Uses 3-arg open in helper routines that read files for hashing/content extraction.
tests/testcurl.pl	Minor Perl formatting tweaks (loop formatting and open(...) call style).
tests/test1488.pl	Uses 3-arg open for reading the symbols-in-versions input.
tests/test1477.pl	Uses 3-arg open for header/manpage scanning.
tests/test1175.pl	Whitespace formatting in variable assignment from regex captures.
tests/test1165.pl	Uses 3-arg open for scanning config/docs inputs.
tests/test1135.pl	Uses 3-arg open for iterating include headers.
tests/test1119.pl	Uses 3-arg open for the preprocessor pipe.
tests/sshserver.pl	Consistent spacing in sshd_supports_opt(...) calls.
tests/servers.pm	Consistent spacing in tuple returns and assignment list.
tests/secureserver.pl	Consistent open(...) formatting for printing written config.
tests/runtests.pl	Uses 3-arg open with consistent quoting for buildinfo.txt.
tests/runner.pm	Consistent for(...) formatting in torture loop.
tests/memanalyze.pl	Consistent for(...) formatting when printing results.
tests/libtest/test613.pl	Uses 3-arg open, consistent spacing in timegm(...) and sprintf(...).
tests/libtest/test610.pl	Consistent spacing in move(...) call.
tests/getpart.pm	Consistent spacing in binmode(..., ":raw").
tests/ftpserver.pl	Consistent spacing in comments/lists and caller indexing; loop formatting.
tests/devtest.pl	Consistent for(...) formatting for qx(...) output iteration.
src/mkhelp.pl	Consistent spacing in numeric expression inside printf.
scripts/release-notes.pl	Uses 3-arg open for writing RELEASE-NOTES.
scripts/mk-ca-bundle.pl	Spacing/formatting in list calls and 3-arg open for temp output file handling.
scripts/managen	Uses 3-arg open when reading curlver.h.
scripts/extract-unit-protos	Uses 3-arg open when scanning input files.
docs/libcurl/symbols.pl	Uses 3-arg open for reading symbols-in-versions.
docs/examples/version-check.pl	Uses 3-arg open for input files (including $ARGV[0]).
.github/scripts/verify-examples.pl	Uses 3-arg open for input/output file handling during example extraction.
.github/scripts/trimmarkdownheader.pl	Uses 3-arg open for in-place file rewrite flow.
.github/scripts/randcurl.pl	Uses 3-arg open and consistent for(...) loop formatting.
.github/scripts/cleancmd.pl	Uses 3-arg open for reading/writing the processed markdown files.

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