modules: move gnome targets into gnome module

They're not used outside of the gnome module anyway, and they create
some annoying potentials for dependency loops

mesonbuild/backend/ninjabackend.py

@@ -29,6 +29,7 @@ import typing as T
 
 from . import backends
 from .. import modules
+from ..modules import gnome
 from .. import environment, mesonlib
 from .. import build
 from .. import mlog
@@ -1558,7 +1559,7 @@ class NinjaBackend(backends.Backend):
                     target.install_dir[3] = os.path.join(self.environment.get_datadir(), 'gir-1.0')
         # Detect gresources and add --gresources arguments for each
         for gensrc in other_src[1].values():
-            if isinstance(gensrc, modules.GResourceTarget):
+            if isinstance(gensrc, gnome.GResourceTarget):
                 gres_xml, = self.get_custom_target_sources(gensrc)
                 args += ['--gresources=' + gres_xml]
         extra_args = []

mesonbuild/modules/__init__.py

@@ -14,9 +14,10 @@
 
 # This file contains the base representation for import('modname')
 
+from __future__ import annotations
 import typing as T
 
-from .. import build, mesonlib
+from .. import mesonlib
 from ..mesonlib import relpath, HoldableObject, MachineChoice
 from ..interpreterbase.decorators import noKwargs, noPosargs
 
@@ -189,18 +190,3 @@ class ModuleReturnValue:
         self.return_value = return_value
         assert isinstance(new_objects, list)
         self.new_objects: T.List[T.Union['TYPE_var', 'build.ExecutableSerialisation']] = new_objects
-
-class GResourceTarget(build.CustomTarget):
-    pass
-
-class GResourceHeaderTarget(build.CustomTarget):
-    pass
-
-class GirTarget(build.CustomTarget):
-    pass
-
-class TypelibTarget(build.CustomTarget):
-    pass
-
-class VapiTarget(build.CustomTarget):
-    pass

mesonbuild/modules/gnome.py

@@ -25,7 +25,6 @@ import textwrap
 import typing as T
 
 from . import ExtensionModule
-from . import GResourceTarget, GResourceHeaderTarget, GirTarget, TypelibTarget, VapiTarget
 from . import ModuleReturnValue
 from .. import build
 from .. import interpreter
@@ -247,6 +246,21 @@ def annotations_validator(annotations: T.List[T.Union[str, T.List[str]]]) -> T.O
                 return f'element {c+1} {badlist}'
     return None
 
+class GResourceTarget(build.CustomTarget):
+    pass
+
+class GResourceHeaderTarget(build.CustomTarget):
+    pass
+
+class GirTarget(build.CustomTarget):
+    pass
+
+class TypelibTarget(build.CustomTarget):
+    pass
+
+class VapiTarget(build.CustomTarget):
+    pass
+
 # gresource compilation is broken due to the way
 # the resource compiler and Ninja clash about it
 #