print build type during CMake config; remove spurious call to pico_is_toplevel_project() (#818)

CMakeLists.txt

@@ -9,6 +9,7 @@ if (NOT TARGET _pico_sdk_inclusion_marker)
 
     project(pico_sdk C CXX ASM)
 
+    message("Build type is ${CMAKE_BUILD_TYPE}")
     if ("${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
         if (PICO_DEOPTIMIZED_DEBUG)
             message("Using fully de-optimized debug build (set PICO_DEOPTIMIZED_DEBUG=0 to optimize)")

pico_sdk_init.cmake

@@ -53,7 +53,6 @@ if (NOT TARGET _pico_sdk_pre_init_marker)
             message(WARNING "pico_sdk_init() should be called after the project is created (and languages added)")
         endif()
         add_subdirectory(${PICO_SDK_PATH} pico-sdk)
-        pico_is_top_level_project(ISTOP)
     endmacro()
 
     macro(add_sub_list_dirs var)