build system: quote values in __build_write_properties

tools/cmake/build.cmake

@@ -265,7 +265,7 @@ function(__build_write_properties output_file)
     idf_build_get_property(build_properties __BUILD_PROPERTIES)
     foreach(property ${build_properties})
         idf_build_get_property(val ${property})
-        set(build_properties_text "${build_properties_text}\nset(${property} ${val})")
+        set(build_properties_text "${build_properties_text}\nset(${property} \"${val}\")")
     endforeach()
     file(WRITE ${output_file} "${build_properties_text}")
 endfunction()