Changed constexpr in const, otherwise clang complained with an error.

(reviewed by pnuske, I toke note of the protest)


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@9223 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/material/components/mesitylene.hh

@@ -143,7 +143,7 @@ public:
         constexpr Scalar p_crit = criticalPressure();
 
         //        Chen method, eq. 7-11.4 (at boiling)
-        constexpr Scalar DH_v_boil = Consts::R * T_crit * Tr1
+        const Scalar DH_v_boil = Consts::R * T_crit * Tr1
         								* (3.978 * Tr1 - 3.958 + 1.555*std::log(p_crit * 1e-5 /*Pa->bar*/ ) )
             							/ (1.07 - Tr1); /* [J/mol] */
 

dumux/material/components/xylene.hh

@@ -188,7 +188,7 @@ public:
         constexpr Scalar p_crit = criticalPressure();
 
         //        Chen method, eq. 7-11.4 (at boiling)
-            	constexpr Scalar DH_v_boil = Consts::R * T_crit * Tr1
+            	const Scalar DH_v_boil = Consts::R * T_crit * Tr1
             							* (3.978 * Tr1 - 3.958 + 1.555*std::log(p_crit * 1e-5 /*Pa->bar*/ ) )
             							/ (1.07 - Tr1); /* [J/mol] */