Tidy up to get external project working

CMakeLists.txt

@@ -15,6 +15,7 @@ pico_sdk_init()
 
 #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror")
 
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
 include(pico_dvhstx.cmake)
 
 add_subdirectory(examples/dvhstx)

libraries/pico_graphics/pico_graphics_dvhstx.hpp

@@ -1,5 +1,5 @@
 #include "pico_graphics.hpp"
-#include "dvhstx.hpp"
+#include "drivers/dvhstx/dvhstx.hpp"
 
 namespace pimoroni {
   enum BlendMode {

pico_dvhstx.cmake

@@ -1,5 +1,5 @@
 
-add_subdirectory(drivers/dvhstx)
+include(drivers/dvhstx/dvhstx)
 
 set(LIB_NAME pico_dvhstx)
 add_library(${LIB_NAME} INTERFACE)