hdf5: require mpich+fortran when hdf5+fortran (#43591)

var/spack/repos/builtin/packages/hdf5/package.py

@@ -112,7 +112,10 @@ class Hdf5(CMakePackage):
     depends_on("cmake@3.12:", type="build")
     depends_on("cmake@3.18:", type="build", when="@1.13:")
 
-    depends_on("mpi", when="+mpi")
+    with when("+mpi"):
+        depends_on("mpi")
+        depends_on("mpich+fortran", when="+fortran ^[virtuals=mpi] mpich")
+
     depends_on("java", type=("build", "run"), when="+java")
     depends_on("szip", when="+szip")
     depends_on("zlib-api")