build: drop the winbuild build system

In favor of CMake.

Closes #18040

.github/scripts/codespell.sh

@@ -14,7 +14,6 @@ codespell \
   --skip 'docs/THANKS' \
   --skip 'packages/*' \
   --skip 'scripts/wcurl' \
-  --skip 'winbuild/*' \
   --ignore-regex '.*spellchecker:disable-line' \
   --ignore-words '.github/scripts/codespell-ignore.txt' \
   $(git ls-files)

.github/scripts/spacecheck.pl

@@ -30,7 +30,7 @@ my @tabs = (
     "^m4/zz40-xc-ovr.m4",
     "Makefile\\.(am|example)\$",
     "/mkfile",
-    "\\.(sln|vc)\$",
+    "\\.sln\$",
     "^tests/data/test",
 );
 
@@ -40,7 +40,6 @@ my @mixed_eol = (
 
 my @need_crlf = (
     "\\.(bat|sln)\$",
-    "^winbuild/.+\\.md\$",
 );
 
 my @space_at_eol = (

.github/scripts/typos.toml

@@ -25,5 +25,4 @@ extend-exclude = [
   "docs/THANKS",
   "packages/*",
   "scripts/wcurl",
-  "winbuild/*",
 ]