Fix GH-8086: Introduce mail.mixed_lf_and_crlf INI

When this INI option is enabled, it reverts the line separator for
headers and message to LF which was a non conformant behavior in PHP

Fix GH-8086: Introduce mail.mixed_lf_and_crlf INI

When this INI option is enabled, it reverts the line separator for
headers and message to LF which was a non conformant behavior in PHP 7.
It is done because some non conformant MTAs fail to parse CRLF line
separator for headers and body.

This is used for mail and mb_send_mail functions.

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