Bug: https://bugs.gentoo.org/692422
Upstream: https://github.com/LibreOffice/core/pull/20

In MySQL Connector/C 8, my_bool is gone and replaced with a bool.  Previously,
it was a char. This triggers errors when trying to convert a char*
to a bool*.  If the MySQL Connector/C version is 8.x of later, use a bool.
Otherwise, default to a char.

--- a/connectivity/source/drivers/mysqlc/mysqlc_preparedstatement.hxx
+++ b/connectivity/source/drivers/mysqlc/mysqlc_preparedstatement.hxx
@@ -39,11 +39,17 @@
 using ::com::sun::star::uno::RuntimeException;
 using ::com::sun::star::uno::Type;
 
+#if defined MYSQL_VERSION_ID && (MYSQL_VERSION_ID >= 80000) && !defined MARIADB_BASE_VERSION
+using my_bool = bool;
+#else
+using my_bool = char;
+#endif
+
 struct BindMetaData
 {
-    char is_null = 0;
+    my_bool is_null = 0;
     unsigned long length = 0;
-    char error = 0;
+    my_bool error = 0;
 };
 
 typedef ::cppu::ImplHelper5<css::sdbc::XPreparedStatement, css::sdbc::XParameters,