spacecheck: check long lines and repeat spaces, fix fallouts

Verify if lines are not longer than 192 characters. Also verify if lines
have less than 79 repeat spaces (and fix one fallout).

To improve readability by avoiding long lines and to prevent adding
overly long lines with text that may go unnoticed in an editor or diff
viewer.

In addition to pre-existing line length limits: 79 for C, 132 for CMake
sources.

Also:
- spacecheck: fix/harden allowlist regexes.
- spacecheck: tidy-up quotes and simplify escaping.
- spacecheck: allow folding strings with repeat spaces.
- GHA: fix a suppressed shellcheck warning.
- GHA/macos: simplify by dropping brew bundle.
- test1119.pl: precompile a regex.
- FAQ.md: delete very long link to a Windows 7/2008 support article
  that's lost it relevance.

Closes #21087

docs/INSTALL.md

@@ -221,7 +221,8 @@ understanding if you are not going to follow the advice given above.
 
 - [How To Use the C Runtime](https://learn.microsoft.com/troubleshoot/developer/visualstudio/cpp/libraries/use-c-run-time)
 - [Runtime Library Compiler Options](https://learn.microsoft.com/cpp/build/reference/md-mt-ld-use-run-time-library)
-- [Potential Errors Passing CRT Objects Across DLL Boundaries](https://learn.microsoft.com/cpp/c-runtime-library/potential-errors-passing-crt-objects-across-dll-boundaries)
+- [Potential Errors Passing CRT Objects
+  Across DLL Boundaries](https://learn.microsoft.com/cpp/c-runtime-library/potential-errors-passing-crt-objects-across-dll-boundaries)
 
 If your app is misbehaving in some strange way, or it is suffering from memory
 corruption, before asking for further help, please try first to rebuild every