serendipity_sendMail: terminate headers with CRLF. #853
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serendipity_sendMail() will concatenate additional headers to a string separated with LF (\n). That is not standard compliant, as RFC 5322 demands CRLF (\r\n).
This has real life implications at least on PHP 8.2.20 with Exim 4.96, as all additional headers are appended to one single long header line, losing encoding information and more.
Change LF to CRLF here.
Fixes #852.