Fix build jit error when interp is disabled (#1008)

When building JIT, interpreter must be enabled, we enabled interpreter
explicitly in config_common.cmake if it is disabled.

build-scripts/config_common.cmake

@@ -121,6 +121,9 @@ message ("     Build as target ${WAMR_BUILD_TARGET}")
 message ("     CMAKE_BUILD_TYPE " ${CMAKE_BUILD_TYPE})
 if (WAMR_BUILD_INTERP EQUAL 1)
   message ("     WAMR Interpreter enabled")
+elseif (WAMR_BUILD_JIT EQUAL 1)
+  set (WAMR_BUILD_INTERP 1)
+  message ("     WAMR Interpreter enabled due to WAMR JIT is enabled")
 else ()
   message ("     WAMR Interpreter disabled")
 endif ()