plugins: add explicit dependency in functional tests

./tests/functional/test_aarch64_tcg_plugins.py needs to have plugin
libinsn built. However, it's not listed as a dependency, so meson can't
know it needs to be built.

Thus, we keep track of all plugins, and add them as an explicit
dependency.

Fixes: 4c134d07b9e ("tests: add a new set of tests to exercise plugins")
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250304222439.2035603-9-alex.bennee@linaro.org>

contrib/plugins/meson.build

@@ -26,3 +26,5 @@ if t.length() > 0
 else
   run_target('contrib-plugins', command: find_program('true'))
 endif
+
+plugin_modules += t

meson.build

@@ -3668,6 +3668,7 @@ qtest_module_ss = ss.source_set()
 
 modules = {}
 target_modules = {}
+plugin_modules = []
 hw_arch = {}
 target_arch = {}
 target_system_arch = {}

tests/functional/meson.build

@@ -385,7 +385,7 @@ foreach speed : ['quick', 'thorough']
       # 'run_target' logic below & in Makefile.include
       test('func-' + testname,
            python,
-           depends: [test_deps, test_emulator, emulator_modules],
+           depends: [test_deps, test_emulator, emulator_modules, plugin_modules],
            env: test_env,
            args: [testpath],
            protocol: 'tap',

tests/tcg/plugins/meson.build

@@ -19,3 +19,5 @@ if t.length() > 0
 else
   run_target('test-plugins', command: find_program('true'))
 endif
+
+plugin_modules += t