Configurations: make Makefile tmpl files non-links

This commit updates Configurations/README.md and turns the Makefile
templates into non-links.

The motivation for this is that not all template exist in the directory
leading to 404 Not found errors when accessed.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12401)

Configurations/README.md

@@ -481,11 +481,9 @@ template file in `Configurations/` named like the build file, with
 `.tmpl` appended, or in case of possible ambiguity, a combination of
 the second `build_scheme` list item and the `build_file` name.  For
 example, if `build_file` is set to `Makefile`, the template could be
-[`Configurations/Makefile.tmpl`](Makefile.tmpl) or
-[`Configurations/unix-Makefile.tmpl`](unix-Makefile.tmpl).
-In case both [`Configurations/unix-Makefile.tmpl`](Makefile.tmpl) and
-[`Configurations/Makefile.tmpl`](Makefile.tmpl) are present, the former takes
-precedence.
+`Configurations/Makefile.tmpl` or `Configurations/unix-Makefile.tmpl`.
+In case both `Configurations/unix-Makefile.tmpl` and
+`Configurations/Makefile.tmpl` are present, the former takes precedence.
 
 The build-file template is processed with the perl module
 Text::Template, using `{-` and `-}` as delimiters that enclose the