A post-fix for:

MDEV-7254 Assigned expression is evaluated twice when updating column TIMESTAMP NOT NULL
The test type_timestamp failed depending on the build machine time zone.
Setting a fixed time zone for the test.

mysql-test/r/type_timestamp.result

@@ -648,6 +648,7 @@ End of 5.5 tests
 #
 # MDEV-7254: Assigned expression is evaluated twice when updating column TIMESTAMP NOT NULL
 #
+SET time_zone='+02:00';
 create table t1(value timestamp not null);
 set @a:=0;
 create function f1 () returns timestamp
@@ -688,4 +689,5 @@ select @a, value from t1;
 drop table t1;
 drop function f1;
 set timestamp=0;
+SET time_zone=DEFAULT;
 End of 10.0 tests

mysql-test/t/type_timestamp.test

@@ -451,6 +451,7 @@ DROP TABLE t1;
 --echo # MDEV-7254: Assigned expression is evaluated twice when updating column TIMESTAMP NOT NULL
 --echo #
 
+SET time_zone='+02:00';
 create table t1(value timestamp not null);
 set @a:=0;
 delimiter //;
@@ -489,5 +490,6 @@ select @a, value from t1;
 drop table t1;
 drop function f1;
 set timestamp=0;
+SET time_zone=DEFAULT;
 
 --echo End of 10.0 tests