_pkg.sh: convert Unix EOLs to CRLF to make Notepad happy

- Restore CRLF in README.txt, COPYING.txt, etc.

This reverts commit be6bfb2. Notepad in recent systems can properly
process LF-only lines but we're releasing a product that can run on
legacy systems where that may not be true.

Fixes curl#42
Closes #xxxx

_pkg.sh

@@ -16,6 +16,7 @@ _cdo="$(pwd)"
 
 if [ "${_NAM}" != "${_UNIPKG}" ]; then
 
+  find "${_DST}" \( -name '*.txt' -o -name '*.md' -o -name '*.rst' \) -exec unix2dos --quiet --keepdate '{}' +
   find "${_DST}" -depth -type d -exec touch -c -r "$1" '{}' +
   chmod -R a+rw-s,go-w "${_DST}"
   # NOTE: Not effective on MSYS2: