qemu build fix

unable to build qemu due to this error :??



./configure ;
Disabling libtool due to broken toolchain support

ERROR: DTC (libfdt) not present. Your options:
         (1) Preferred: Install the DTC (libfdt) devel package
         (2) Fetch the DTC submodule, using:
             git submodule update --init dtc

So, just do this before configure
git submodule update --init dtc