update CFLAGS and LDFLAGS to support raspbian
Created by: happydig
modify cgoflags.go to support raspbian. cgo pkg-config: hdf5 solution does not work with homebrew and ubuntu trusty, though it works on raspbian stretch and ubuntu 18.10.
Created by: happydig
modify cgoflags.go to support raspbian. cgo pkg-config: hdf5 solution does not work with homebrew and ubuntu trusty, though it works on raspbian stretch and ubuntu 18.10.