programs: Store the project version when overriding find_program

When we're using the output of configure_file() with
override_find_program(), we weren't storing the version anywhere, so
get_version() was trying to run the script during setup.

This is usually fine, except in cases where the configure_file()
script actually has to import a library built as part of the project,
and fails to run.

For built executables, we simply use the project version, and we
now do the same here too.

mesonbuild/interpreter/mesonmain.py

@@ -334,7 +334,7 @@ def override_find_program_method(self, args: T.Tuple[str, T.Union[mesonlib.File,
                                         self.interpreter.environment.build_dir)
             if not os.path.exists(abspath):
                 raise InterpreterException(f'Tried to override {name} with a file that does not exist.')
-            exe = OverrideProgram(name, [abspath])
+            exe = OverrideProgram(name, [abspath], version=self.interpreter.project_version)
         self.interpreter.add_find_program_override(name, exe)
 
     @typed_kwargs(

mesonbuild/programs.py

@@ -340,6 +340,12 @@ class OverrideProgram(ExternalProgram):
 
     """A script overriding a program."""
 
+    def __init__(self, *args, version: str, **kwargs: T.Any) -> None:
+        self.version = version
+        super().__init__(*args, **kwargs)
+
+    def get_version(self, interpreter: T.Optional['Interpreter'] = None) -> str:
+        return self.version
 
 def find_external_program(env: 'Environment', for_machine: MachineChoice, name: str,
                           display_name: str, default_names: T.List[str],