Delete some redundant CMake parts (#240)

tools/CMakeLists.txt

@@ -44,17 +44,3 @@ function(pico_add_uf2_output TARGET)
                 COMMAND ELF2UF2 ${TARGET}${CMAKE_EXECUTABLE_SUFFIX} ${TARGET}.uf2)
     endif()
 endfunction()
-
-if (NOT DEFINED PICO_BUILD_PICOFLASH)
-    if (DEFINED ENV{PICO_BUILD_PICOFLASH})
-        set(PICO_BUILD_PICOFLASH $ENV{PICO_BUILD_PICOFLASH})
-    else()
-        # for now
-        set(PICO_BUILD_PICOFLASH 1)
-    endif()
-endif()
-
-if (PICO_BUILD_PICOTOOL)
-    set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PICO_SDK_PATH}/tools)
-    find_package(Picotool REQUIRED)
-endif()

tools/FindPicotool.cmake

@@ -1,43 +0,0 @@
-# Finds (or builds) the PICOTOOL executable
-#
-# This will define the following variables
-#
-#    PICOTOOL_FOUND
-#
-# and the following imported targets
-#
-#     PICOTOOL
-#
-
-if (NOT PICOTOOL_FOUND)
-    # todo we would like to use pckgconfig to look for it first
-    # see https://pabloariasal.github.io/2018/02/19/its-time-to-do-cmake-right/
-
-    include(ExternalProject)
-
-    set(PICOTOOL_SOURCE_DIR ${PICO_SDK_PATH}/tools/picotool)
-    set(PICOTOOL_BINARY_DIR ${CMAKE_BINARY_DIR}/picotool)
-
-    set(PICOTOOL_BUILD_TARGET PicotoolBuild)
-    set(PICOTOOL_TARGET Picotool)
-
-    if (NOT TARGET ${PICOTOOL_BUILD_TARGET})
-        message("PICOTOOL will need to be built")
-        ExternalProject_Add(${PICOTOOL_BUILD_TARGET}
-                PREFIX picotool SOURCE_DIR ${PICOTOOL_SOURCE_DIR}
-                BINARY_DIR ${PICOTOOL_BINARY_DIR}
-                BUILD_ALWAYS 1 # force dependency checking
-                INSTALL_COMMAND ""
-                )
-    endif()
-
-    set(PICOTOOL_EXECUTABLE ${PICOTOOL_BINARY_DIR}/picotool)
-    if(NOT TARGET ${PICOTOOL_TARGET})
-        add_executable(${PICOTOOL_TARGET} IMPORTED)
-    endif()
-    set_property(TARGET ${PICOTOOL_TARGET} PROPERTY IMPORTED_LOCATION
-            ${PICOTOOL_EXECUTABLE})
-
-    add_dependencies(${PICOTOOL_TARGET} ${PICOTOOL_BUILD_TARGET})
-    set(PICOTOOL_FOUND 1)
-endif()