cmakelint: also lint CMake .in files, fix a long line

```
CMakeConfigurableFile.in
cmake_uninstall.cmake.in
curl-config.cmake.in
```

Follow-up to 16f073ef49 #16973
Closes #19773

scripts/cmakelint.sh

@@ -52,7 +52,7 @@ cd "$(dirname "$0")"/..
     # strip off the leading ./ to make the grep regexes work properly
     find . -type f | sed 's@^\./@@'
   fi
-} | grep -E '(^CMake|/CMake|\.cmake$)' | grep -v -E '(\.h\.cmake|\.in|\.c)$' \
+} | grep -E '(^CMake|/CMake|\.cmake$)' | grep -v -E '(\.h\.cmake|\.c)$' \
   | xargs \
   cmake-lint \
     --suppress-decorations \