Not include MKL when headers only (#615)

## Description
As the title

## Type
- [x] Bug  - [ ] Feature  - [ ] Performance  - [ ] Refactor

## Testing
- [ ] Tests pass  - [ ] Xe12  - [ ] Xe20

## Performance
| Metric | Before | After |
|--------|--------|-------|
|        |        |       |

## References
Fixes #

## Checklist
- [ ] Copyright  - [ ] Co-pilot Review  - [ ] Deprecated APIs not used

Author: airMeng

CMakeLists.txt

@@ -158,7 +158,6 @@ if (CUTLASS_ENABLE_SYCL)
     add_compile_definitions(CUTLASS_SYCL_BUILTIN_ENABLE)
   endif()
 
-  include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/onemkl.cmake)
 endif()
 find_package(Doxygen QUIET)
 
@@ -201,7 +200,7 @@ set(CUTLASS_ENABLE_HEADERS_ONLY OFF CACHE BOOL "Enable only the header library")
 
 if(CUTLASS_ENABLE_HEADERS_ONLY)
   set(CUTLASS_ENABLE_EXAMPLES_INIT OFF)
-  set(CUTLASS_ENABLE_TOOLS_INIT ON)
+  set(CUTLASS_ENABLE_TOOLS_INIT OFF)
   set(CUTLASS_ENABLE_LIBRARY_INIT OFF)
   set(CUTLASS_ENABLE_TESTS_INIT OFF)
 else()
@@ -213,6 +212,9 @@ else()
   else()
     set(CUTLASS_ENABLE_TESTS_INIT OFF)
   endif()
+
+  # Not include MKL when headers only
+  include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/onemkl.cmake)
 endif()
 
 set(CUTLASS_TEST_UNIT_ENABLE_WARNINGS OFF CACHE BOOL "Enable warnings on waived unit tests.")