Ninja: Avoid cleandead with dyndep bindings for Fortran module dependencies

The Ninja `cleandead` tool does not account for implicit outputs
discovered by `dyndep` bindings and can remove Fortran `.mod` files that
are still needed.  Disable the `cleandead` step when using `dyndep`
bindings.

Fixes: #21406

1 files changed, 1 insertions, 0 deletions

diff --git a/Source/cmGlobalNinjaGenerator.h b/Source/cmGlobalNinjaGenerator.h
index 884a711..a0724ac 100644
--- a/Source/cmGlobalNinjaGenerator.h
+++ b/Source/cmGlobalNinjaGenerator.h
@@ -545,6 +545,7 @@ private:
   std::string OutputPathPrefix;
   std::string TargetAll;
   std::string CMakeCacheFile;
+  bool DisableCleandead = false;
 
   struct ByConfig
   {