fms: add two variants (#43734)

* fms: add two variants supporting existing build options.
* Style fixes.

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

@@ -85,6 +85,12 @@ class Fms(CMakePackage):
         description="Compiles with support for deprecated io modules fms_io and mpp_io",
         when="@2023.02:",
     )
+    variant("large_file", default=False, description="Enable compiler definition -Duse_LARGEFILE.")
+    variant(
+        "internal_file_nml",
+        default=True,
+        description="Enable compiler definition -DINTERNAL_FILE_NML.",
+    )
 
     depends_on("netcdf-c")
     depends_on("netcdf-fortran")
@@ -98,6 +104,8 @@ def cmake_args(self):
             self.define_from_variant("ENABLE_QUAD_PRECISION", "quad_precision"),
             self.define_from_variant("WITH_YAML", "yaml"),
             self.define_from_variant("CONSTANTS"),
+            self.define_from_variant("LARGEFILE", "large_file"),
+            self.define_from_variant("INTERNAL_FILE_NML"),
             self.define("32BIT", "precision=32" in self.spec),
             self.define("64BIT", "precision=64" in self.spec),
             self.define_from_variant("FPIC", "pic"),