Fix incorrect passing of argument to mysql_options

[vtermanis]

I noticed that it would appear arguments for some mysql_options calls are not being passed as documented in that they are absolute values rather than references! I noticed this from gcc warnings, e.g.:

src/mysql_capi.c: In function ‘MySQL_connect’:
src/mysql_capi.c:1118:63: warning: passing argument 3 of ‘mysql_options’ makes pointer from integer without a cast [-Wint-conversion]
             mysql_options(&self->session, MYSQL_OPT_SSL_MODE, SSL_MODE_REQUIRED);

Additionally, SSL_MODE_DISABLED is being used as an argument for MYSQL_OPT_SSL_ENFORCE, where it appears it should actually be MYSQL_OPT_SSL_MODE.

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
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Thanks

[vtermanis]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=83338 for updates.
Thanks