Fix shared module installation directory on Windows

mesonbuild/backend/ninjabackend.py

@@ -643,6 +643,8 @@ int dummy;
                 # we want this specific output out of many outputs to not
                 # be installed.
                 custom_install_dir = True
+            elif isinstance(t, build.SharedModule):
+                outdirs[0] = self.environment.get_shared_module_dir()
             elif isinstance(t, build.SharedLibrary):
                 outdirs[0] = self.environment.get_shared_lib_dir()
             elif isinstance(t, build.StaticLibrary):

mesonbuild/environment.py

@@ -741,6 +741,10 @@ class Environment:
         "Install dir for the import library (library used for linking)"
         return self.get_libdir()
 
+    def get_shared_module_dir(self):
+        "Install dir for shared modules that are loaded at runtime"
+        return self.get_libdir()
+
     def get_shared_lib_dir(self):
         "Install dir for the shared library"
         if self.win_libdir_layout: