warn about bugs in Apple Accelerate in cmake

include/multi/adaptors/blas/CMakeLists.txt

@@ -32,6 +32,7 @@ if(BLAS_FOUND)
 		endif()
 		if(${lib} MATCHES "Accelerate")
 			message("Some BLAS found matches Accelerate (Apple)")
+			message(WARNING "Apple Accelerate BLAS is know to have bugs in single precission function `sdot` and `smrm2`, be careful: https://stackoverflow.com/a/77017238/225186, https://fortran-lang.discourse.group/t/how-many-blas-libraries-have-this-error/4454/23, https://forums.developer.apple.com/forums/thread/717757")
 			add_definitions(-DBLAS_DOT_RETURNS_VOID)
 		endif()
 	endforeach()