Do not build tests in release mode

Assertions would not be executed.

And as a side effect, it causes "unused variable" warnings.

app/meson.build

@@ -141,40 +141,43 @@ install_man('scrcpy.1')
 
 ### TESTS
 
-tests = [
-    ['test_buffer_util', [
-        'tests/test_buffer_util.c'
-    ]],
-    ['test_cbuf', [
-        'tests/test_cbuf.c',
-    ]],
-    ['test_cli', [
-        'tests/test_cli.c',
-        'src/cli.c',
-        'src/util/str_util.c',
-    ]],
-    ['test_control_event_serialize', [
-        'tests/test_control_msg_serialize.c',
-        'src/control_msg.c',
-        'src/util/str_util.c',
-    ]],
-    ['test_device_event_deserialize', [
-        'tests/test_device_msg_deserialize.c',
-        'src/device_msg.c',
-    ]],
-    ['test_queue', [
-        'tests/test_queue.c',
-    ]],
-    ['test_strutil', [
-        'tests/test_strutil.c',
-        'src/util/str_util.c',
-    ]],
-]
+# do not build tests in release (assertions would not be executed at all)
+if get_option('buildtype') == 'debug'
+    tests = [
+        ['test_buffer_util', [
+            'tests/test_buffer_util.c'
+        ]],
+        ['test_cbuf', [
+            'tests/test_cbuf.c',
+        ]],
+        ['test_cli', [
+            'tests/test_cli.c',
+            'src/cli.c',
+            'src/util/str_util.c',
+        ]],
+        ['test_control_event_serialize', [
+            'tests/test_control_msg_serialize.c',
+            'src/control_msg.c',
+            'src/util/str_util.c',
+        ]],
+        ['test_device_event_deserialize', [
+            'tests/test_device_msg_deserialize.c',
+            'src/device_msg.c',
+        ]],
+        ['test_queue', [
+            'tests/test_queue.c',
+        ]],
+        ['test_strutil', [
+            'tests/test_strutil.c',
+            'src/util/str_util.c',
+        ]],
+    ]
 
-foreach t : tests
-    exe = executable(t[0], t[1],
-                     include_directories: src_dir,
-                     dependencies: dependencies,
-                     c_args: ['-DSDL_MAIN_HANDLED'])
-    test(t[0], exe)
-endforeach
+    foreach t : tests
+        exe = executable(t[0], t[1],
+                         include_directories: src_dir,
+                         dependencies: dependencies,
+                         c_args: ['-DSDL_MAIN_HANDLED'])
+        test(t[0], exe)
+    endforeach
+endif