Fix ssl_enforce=true option

Reported
[here](JuliaDatabases/DBInterface.jl#25). The
issue here was our `ssl_enforce` C enum value wasn't in the "boolean"
options list, so it was attempting to treat it as a string which
obviously failed.

Author: quinnj

Project.toml

@@ -20,7 +20,7 @@ DBInterface = "2"
 Tables = "1"
 DecFP = "0.4"
 MariaDB_Connector_C_jll = "3"
-Parsers = "0.3"
+Parsers = "0.3, 1"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

src/api/consts.jl

@@ -196,7 +196,7 @@ end
 
 const CUINTOPTS = Set([MYSQL_OPT_CONNECT_TIMEOUT, MYSQL_OPT_PROTOCOL, MYSQL_OPT_READ_TIMEOUT, MYSQL_OPT_WRITE_TIMEOUT])
 const CULONGOPTS = Set([MYSQL_OPT_MAX_ALLOWED_PACKET, MYSQL_OPT_NET_BUFFER_LENGTH])
-const BOOLOPTS = Set([MYSQL_ENABLE_CLEARTEXT_PLUGIN, MYSQL_OPT_CAN_HANDLE_EXPIRED_PASSWORDS, MYSQL_OPT_LOCAL_INFILE, MYSQL_OPT_RECONNECT, MYSQL_REPORT_DATA_TRUNCATION])
+const BOOLOPTS = Set([MYSQL_ENABLE_CLEARTEXT_PLUGIN, MYSQL_OPT_CAN_HANDLE_EXPIRED_PASSWORDS, MYSQL_OPT_LOCAL_INFILE, MYSQL_OPT_RECONNECT, MYSQL_REPORT_DATA_TRUNCATION, MYSQL_OPT_SSL_ENFORCE])
 const STRINGOPTS = Set([MYSQL_DEFAULT_AUTH, MYSQL_OPT_BIND, MYSQL_OPT_SSL_CA, MYSQL_OPT_SSL_CAPATH, MYSQL_OPT_SSL_CERT, MYSQL_OPT_SSL_CIPHER, MYSQL_OPT_SSL_CRL, MYSQL_OPT_SSL_CRLPATH, MYSQL_OPT_SSL_KEY, MYSQL_OPT_TLS_VERSION, MYSQL_PLUGIN_DIR, MYSQL_READ_DEFAULT_FILE, MYSQL_READ_DEFAULT_GROUP, MYSQL_SERVER_PUBLIC_KEY, MYSQL_SET_CHARSET_DIR, MYSQL_SET_CHARSET_NAME, MYSQL_SHARED_MEMORY_BASE_NAME])
 
 const MYSQL_TIMESTAMP_DATE     = 0