only use this configure option for shark backend

package/openjdk/Makefile

@@ -65,7 +65,8 @@ ifeq ($(ADK_PACKAGE_OPENJDK_ZERO),y)
 CONFIGURE_BACKEND:=	--enable-zero
 endif
 ifeq ($(ADK_PACKAGE_OPENJDK_SHARK),y)
-CONFIGURE_BACKEND:=	--enable-shark
+CONFIGURE_BACKEND:=	--enable-shark \
+			--with-llvm-config=$(STAGING_TARGET_DIR)/usr/bin/llvm-config
 endif
 ifeq ($(ADK_PACKAGE_OPENJDK_CACAO),y)
 CONFIGURE_BACKEND:=	--enable-cacao
@@ -78,7 +79,6 @@ CONFIGURE_ARGS+=	$(CONFIGURE_BACKEND)
 CONFIGURE_ARGS+=	--disable-docs \
 			--disable-bootstrap \
 			--enable-openjdk-cross-compilation \
-			--with-llvm-config=$(STAGING_TARGET_DIR)/usr/bin/llvm-config \
 			--with-openjdk-src-dir=$(WRKDIST)/$(PKG_NAME)-$(PKG_VERSION) \
 			--with-xalan2-jar=${WRKDIST}/${XALAN_NAME}_${XALAN_VERSION}/xalan.jar \
 			--with-xalan2-serializer-jar=${WRKDIST}/${XALAN_NAME}_${XALAN_VERSION}/serializer.jar \