ParseC.pm: gracefully handle DOS-style end-of-line in source files

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from #19686)

(cherry picked from commit c507db9)

util/perl/OpenSSL/ParseC.pm

@@ -822,7 +822,7 @@ sub parse {
         # We use ¦undef¦ as a marker for a new line from the file.
         # Since we convert one line to several and unshift that into @lines,
         # that's the only safe way we have to track the original lines
-        my @lines = map { ( undef, $_ ) } split $/, $line;
+        my @lines = map { ( undef, $_ ) } split m|\R|, $line;
 
         # Remember that extra # we added above?  Now we remove it
         pop @lines;