add osmo-fl2k support

builder/stage4/28-pisdr-osmo-fl2k/00-packages-nr

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+libusb-1.0-0-dev

builder/stage4/28-pisdr-osmo-fl2k/00-run.sh

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+#!/bin/bash -e
+
+on_chroot << EOF
+mkdir -p    "/home/${FIRST_USER_NAME}/PiSDR/Software"
+cd 		    "/home/${FIRST_USER_NAME}/PiSDR/Software"
+
+if [ ! -d "osmo-fl2k" ]; then
+    git clone git://git.osmocom.org/osmo-fl2k.git
+fi
+
+cd osmo-fl2k
+mkdir -p build
+cd build
+cmake -GNinja -DINSTALL_UDEV_RULES=ON ..
+ninja install
+ldconfig
+cd ..
+rm -fr build
+EOF