[meson] Add use_bundled_deps option

tests/meson.build

@@ -133,10 +133,10 @@ parallel_ok = (not io_uring_enabled)
 
 # Meson integration for GTest and GMock
 # See https://mesonbuild.com/Dependencies.html#gtest-and-gmock
-gtest_dep = dependency('gtest', main: true, required: false)
+gtest_dep = dependency('gtest', main: true, required: use_bundled_deps == 'never')
 # If gtest is not available on the system use the meson wrap provided
 # by WrapDB and build it ourself
-if not gtest_dep.found()
+if not gtest_dep.found() or use_bundled_deps == 'always'
 	gtest_sp = subproject('gtest')
 	gtest_dep = gtest_sp.get_variable('gtest_main_dep')
 endif