[DAPHNE-daphne-eu#830] Fix duplicate symbol linker issue

Compiling with Clang/LLD complains about duplicate symbols of supportsUnaryOp and supportsBinaryOp.

src/runtime/local/kernels/BinaryOpCode.h

@@ -93,7 +93,7 @@ static constexpr bool supportsBinaryOp = false;
 // simplicity).
 #define SUPPORT(Op, VT)                                                        \
     template <>                                                                \
-    constexpr bool supportsBinaryOp<BinaryOpCode::Op, VT, VT, VT> = true;
+    static constexpr bool supportsBinaryOp<BinaryOpCode::Op, VT, VT, VT> = true;
 
 // Generates code specifying that all binary operations of a certain category
 // should be supported on the given value type `VT` (for the result and the two
@@ -154,10 +154,10 @@ SUPPORT_NUMERIC_INT(uint64_t)
 SUPPORT_NUMERIC_INT(uint32_t)
 SUPPORT_NUMERIC_INT(uint8_t)
 template <>
-constexpr bool supportsBinaryOp<BinaryOpCode::CONCAT, const char *,
+static constexpr bool supportsBinaryOp<BinaryOpCode::CONCAT, const char *,
                                 const char *, const char *> = true;
 template <>
-constexpr bool
+static constexpr bool
     supportsBinaryOp<BinaryOpCode::EQ, int64_t, const char *, const char *> =
         true;
 

src/runtime/local/kernels/UnaryOpCode.h

@@ -88,7 +88,7 @@ static constexpr bool supportsUnaryOp = false;
 // on the value type `VT` (for both the result and the argument, for
 // simplicity).
 #define SUPPORT(Op, VT)                                                        \
-    template <> constexpr bool supportsUnaryOp<UnaryOpCode::Op, VT, VT> = true;
+    template <> static constexpr bool supportsUnaryOp<UnaryOpCode::Op, VT, VT> = true;
 
 // Generates code specifying that all unary operations typically supported on
 // numeric value types should be supported on the given value type `VT`