Testsuite: refactor OCaml handling

Instead of using a dedicated machinery to automatically skip tests
requiring an OCaml toolchain, use the standard "control" mechanism from
e3-testsuite.

TN: S521-024

testsuite/drivers/base_driver.py

@@ -2,7 +2,7 @@ import os
 import os.path
 
 from e3.testsuite.control import YAMLTestControlCreator
-from e3.testsuite.driver.classic import TestAbortWithError, TestSkip
+from e3.testsuite.driver.classic import TestAbortWithError
 from e3.testsuite.driver.diff import DiffTestDriver, PatternSubstitute
 
 from drivers.valgrind import valgrind_cmd
@@ -17,15 +17,6 @@ class BaseDriver(DiffTestDriver):
     def test_control_creator(self):
         return YAMLTestControlCreator(self.env.control_condition_env)
 
-    def set_up(self):
-        super().set_up()
-
-        if (
-            self.test_env.get('require_ocaml', False) and
-            self.env.options.disable_ocaml
-        ):
-            raise TestSkip('Test requires OCaml')
-
     @property
     def output_refiners(self):
         # RA22-015: Line numbers for Python DSL diagnostics vary depending on

testsuite/tests/ocaml_api/general/test.yaml

@@ -1,3 +1,4 @@
 driver: python
-require_ocaml: True
 encoding: utf-8
+control:
+    - [SKIP, "not has_ocaml", "OCaml support required"]

testsuite/testsuite.py

@@ -106,6 +106,7 @@ class LangkitTestsuite(Testsuite):
         self.env.rewrite_baselines = args.rewrite
         self.env.control_condition_env = {
             'restricted_env': args.restricted_env,
+            'has_ocaml': not args.disable_ocaml,
         }
 
         if args.coverage: