PDO Firebird: Use recreate table

Firebird does not have "if exists", and the switch to exception
error mode broke the suppressed exec calls.

Firebird does have a "recreate table" command that effective
perform a "drop table if exists" beforehand.

Author: nikic

ext/pdo_firebird/tests/bug_72583.phpt

@@ -6,8 +6,7 @@ PDO_Firebird: Feature 72583 Fetch integers as php integers not as strings
 <?php
 require 'testdb.inc';
 
-@$dbh->exec('drop table atable');
-$dbh->exec('create table atable (aint integer, asmi smallint)');
+$dbh->exec('recreate table atable (aint integer, asmi smallint)');
 $dbh->exec('insert into atable values (1, -1)');
 $S = $dbh->prepare('select aint, asmi from atable');
 $S->execute();

ext/pdo_firebird/tests/bug_72931.phpt

@@ -6,8 +6,7 @@ PDO_Firebird: Bug 72931 Insert returning fails on Firebird 3
 <?php
 require 'testdb.inc';
 
-@$dbh->exec('drop table tablea');
-$dbh->exec('create table tablea (id integer)');
+$dbh->exec('recreate table tablea (id integer)');
 $S = $dbh->prepare('insert into tablea (id) values (1) returning id');
 $S->execute();
 $D = $S->fetch(PDO::FETCH_NUM);

ext/pdo_firebird/tests/bug_73087.phpt

@@ -6,8 +6,7 @@ PDO_Firebird: bug 73087 segfault binding blob parameter
 <?php
 require 'testdb.inc';
 
-@$dbh->exec('drop table atable');
-$dbh->exec('create table atable (id integer not null, content blob sub_type 1 segment size 80)');
+$dbh->exec('recreate table atable (id integer not null, content blob sub_type 1 segment size 80)');
 $S = $dbh->prepare('insert into atable (id, content) values (:id, :content)');
 for ($I = 1; $I < 10; $I++) {
     $Params = [

ext/pdo_firebird/tests/bug_74462.phpt

@@ -6,8 +6,7 @@ PDO_Firebird: Bug #74462 Returns only NULLs for boolean fields
 <?php
 require 'testdb.inc';
 
-@$dbh->exec('drop table atable');
-$dbh->exec('create table atable (id integer not null, abool boolean)');
+$dbh->exec('recreate table atable (id integer not null, abool boolean)');
 $dbh->exec('insert into atable (id, abool) values (1, true)');
 $dbh->exec('insert into atable (id, abool) values (2, false)');
 $dbh->exec('insert into atable (id, abool) values (3, null)');