resolve: Add LUSOL variant and fix CMake variable definition. (#44790)

* resolve: Add LUSOL variant and fix CMake variable definition.
* Update variant with correct version constraints.

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

@@ -26,6 +26,12 @@ class Resolve(CMakePackage, CudaPackage, ROCmPackage):
     depends_on("cxx", type="build")  # generated
 
     variant("klu", default=True, description="Use KLU, AMD and COLAMD Libraries from SuiteSparse")
+    variant(
+        "lusol",
+        default=True,
+        when="@develop:",
+        description="Build the LUSOL Library. Requires fortran",
+    )
 
     depends_on("suite-sparse", when="+klu")
 
@@ -46,7 +52,11 @@ def cmake_args(self):
         spec = self.spec
 
         args.extend(
-            [self.define("RESOLVE_USE_KLU", "klu"), self.define("RESOLVE_TEST_WITH_BSUB", False)]
+            [
+                self.define_from_variant("RESOLVE_USE_KLU", "klu"),
+                self.define_from_variant("RESOLVE_USE_LUSOL", "lusol"),
+                self.define("RESOLVE_TEST_WITH_BSUB", False),
+            ]
         )
 
         if "+cuda" in spec: