A couple of tiny tweaks for AUv2 as a sub module (#108)

as I start on auv2 info plist and so on, these stopped me right
away. With the, the single plugin case at least works
as a sub. except nothing works with auv2 of course!

cmake/enable_sdks.cmake

@@ -512,7 +512,7 @@ if (APPLE)
 			# is a placeholder. When we write it we will follow a similar
 			# split trick as for the vst3, mostly (but AUV2 is a bit different
 			# with info.plist and entrypoint-per-instance stuff)
-			target_sources(${AUV2_TARGET} PRIVATE src/wrapasauv2.cpp)
+			target_sources(${AUV2_TARGET} PRIVATE ${CLAP_WRAPPER_CMAKE_CURRENT_SOURCE_DIR}/src/wrapasauv2.cpp)
 
 
 			if (NOT TARGET ${AUV2_TARGET}-clap-wrapper-auv2-lib)
@@ -551,7 +551,7 @@ if (APPLE)
 					MACOSX_BUNDLE_BUNDLE_NAME ${AUV2_OUTPUT_NAME}
 					MACOSX_BUNDLE_BUNDLE_VERSION ${AUV2_BUNDLE_VERSION}
 					MACOSX_BUNDLE_SHORT_VERSION_STRING ${AUV2_BUNDLE_VERSION}
-					MACOSX_BUNDLE_INFO_PLIST ${CMAKE_SOURCE_DIR}/cmake/auv2_Info.plist.in
+					MACOSX_BUNDLE_INFO_PLIST ${CLAP_WRAPPER_CMAKE_CURRENT_SOURCE_DIR}/cmake/auv2_Info.plist.in
 					)
 			if (NOT ${CMAKE_GENERATOR} STREQUAL "Xcode")
 				add_custom_command(TARGET ${AUV2_TARGET} POST_BUILD