tidy-up: miscellaneous

- avoid "will" in builds scripts, scripts folder, curl_easy_ssls_export.md,
  and few other files.
- badwords: add "initialise", "nul terminated", "thread safety" and
  variations.
- prefer "null-terminat", where missing (two places).
- fix "null-terminat*" missing dash.
- hostip: merge two `#if` blocks.
- tool_doswin: fix comment
  Spotted by GitHub Code Quality
  Follow-up to 9a2663322c #17572
- fix stray spaces and newlines.

Closes #21638

.github/scripts/cmp-config.pl

@@ -34,8 +34,7 @@ if(!$cmake) {
     exit;
 }
 
-# this lists complete lines that will be removed from the output if
-# matching
+# this lists complete lines that are removed from the output if matching
 my %remove = (
     '#define CURL_EXTERN_SYMBOL' => 1,
     '#define CURL_OS "Linux"' => 1,