COMP: drop construct Field from SubField for non-Intel

- duplicates existing SubField -> Field conversion method
- retain for Intel until we confirm it works there too

src/OpenFOAM/fields/Fields/Field/Field.C

@@ -166,8 +166,7 @@ Foam::Field<Type>::Field(const Xfer<Field<Type> >& f)
 {}
 
 
-#ifndef __GNUC__
-// Not needed for clang/gcc
+#ifdef __INTEL_COMPILER
 template<class Type>
 Foam::Field<Type>::Field(const typename Field<Type>::subField& sf)
 :

src/OpenFOAM/fields/Fields/Field/Field.H

@@ -176,8 +176,10 @@ public:
         //- Construct by transferring the Field contents
         Field(const Xfer<Field<Type> >&);
 
+#ifdef __INTEL_COMPILER
         //- Construct as copy of subField
         Field(const typename Field<Type>::subField&);
+#endif
 
         //- Construct as copy of tmp<Field>
 #       ifdef ConstructFromTmp
@@ -188,7 +190,7 @@ public:
         Field(Istream&);
 
         //- Construct from a dictionary entry
-        Field(const word& keyword, const dictionary& dict, const label size);
+        Field(const word& keyword, const dictionary&, const label size);
 
         //- Clone
         tmp<Field<Type> > clone() const;