databases/qt5-sqldrivers-mysql: fix against mysql 5.7.34

In mysql 5.7.34 binding a parameter to a 0-sized buffer triggers
an assert() -- previously this was DBG_ASSERT. This triggers
crashes in databases/akonadi in particular, which binds blobs of
size 0. This patch allows akonadi with the default mysql to
start (at all) again.

The patch file previously held a Qt4-era patch which had long
ago had a better patch applied upstream (the comment in the
patch refers to that). The old stuff has been removed, leaving
only the parameter-fix.

databases/qt5-sqldrivers-mysql/Makefile

@@ -1,3 +1,4 @@
+PORTREVISION=	1
 
 DB=		MYSQL
 DB_DESC=	MySQL

databases/qt5-sqldrivers-mysql/files/patch-src_plugins_sqldrivers_mysql_qsql__mysql.cpp

@@ -1,63 +1,16 @@
-https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html
+--- src/plugins/sqldrivers/mysql/qsql_mysql.cpp.orig	2020-10-27 08:02:11 UTC
-
-Incompatible Change: The my_bool type is no longer used in MySQL
-source code. Any third-party code that used this type to represent
-C boolean variables should use the bool or int C type instead.
-
-Note
-The change from my_bool to bool means that the mysql.h header file
-now requires a C++ or C99 compiler to compile.
-
-(Bug #25597667)
-
-For Qt5, which requires C++11, the following line single-line
-definition for mysql_bool is less-fragile and more C++y:
-	using mysql_bool = decltype(MYSQL_BIND::is_null_value);
-This does not apply to the Qt4 port, which allows older compilers
-and the less-fragile approach would therefore break on old-gcc-in-base
-architectures.
-
---- src/plugins/sqldrivers/mysql/qsql_mysql.cpp.orig	2020-03-11 15:29:12 UTC
 +++ src/plugins/sqldrivers/mysql/qsql_mysql.cpp
-@@ -71,6 +71,14 @@ Q_DECLARE_METATYPE(MYSQL_STMT*)
+@@ -352,11 +360,11 @@ void QMYSQLResultPrivate::bindBlobs()
- // by redefining it we can regain source compatibility.
- using my_bool = decltype(mysql_stmt_bind_result(nullptr, nullptr));
  
-+// MYSQL 8.0.1 no longer uses the my_bool type:
+     for(i = 0; i < fields.count(); ++i) {
-+// https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html
+         fieldInfo = fields.at(i).myField;
-+#if (MYSQL_VERSION_ID >= 80001) && !defined(MARIADB_BASE_VERSION)
+-        if (qIsBlob(inBinds[i].buffer_type) && meta && fieldInfo) {
-+typedef bool mysql_bool;
++        if (qIsBlob(inBinds[i].buffer_type) && meta && fieldInfo && fieldInfo->max_length) {
-+#else
+             bind = &inBinds[i];
-+typedef my_bool mysql_bool;
+             bind->buffer_length = fieldInfo->max_length;
-+#endif
+             delete[] static_cast<char*>(bind->buffer);
-+
+-            bind->buffer = new char[fieldInfo->max_length];
- QT_BEGIN_NAMESPACE
++            bind->buffer = new char[bind->buffer_length];
- 
+             fields[i].outField = static_cast<char*>(bind->buffer);
- class QMYSQLDriverPrivate : public QSqlDriverPrivate
+         }
-@@ -930,7 +938,7 @@ bool QMYSQLResult::exec()
+     }
-     MYSQL_BIND* currBind;
-     QVector<MYSQL_TIME *> timeVector;
-     QVector<QByteArray> stringVector;
--    QVector<my_bool> nullVector;
-+    QVector<mysql_bool> nullVector;
- 
-     const QVector<QVariant> values = boundValues();
- 
-@@ -951,7 +959,7 @@ bool QMYSQLResult::exec()
- 
-             currBind = &d->outBinds[i];
- 
--            nullVector[i] = static_cast<my_bool>(val.isNull());
-+            nullVector[i] = static_cast<mysql_bool>(val.isNull());
-             currBind->is_null = &nullVector[i];
-             currBind->length = 0;
-             currBind->is_unsigned = 0;
-@@ -1048,7 +1056,7 @@ bool QMYSQLResult::exec()
-     d->rowsAffected = mysql_stmt_affected_rows(d->stmt);
- 
-     if (isSelect()) {
--        my_bool update_max_length = true;
-+        mysql_bool update_max_length = true;
- 
-         r = mysql_stmt_bind_result(d->stmt, d->inBinds);
-         if (r != 0) {