introduce gcovpreload repo

new-added gcov_preload repo

Author: pettershao-ragilenetworks

src/preload/Makefile

@@ -0,0 +1,11 @@
+.ONESHELL:
+SHELL = /bin/bash
+.SHELLFLAGS += -e
+
+MAIN_TARGET = libgcovpreload_$(GCOV_PRELOAD_VERSION_FULL)_$(CONFIGURED_ARCH).deb
+
+$(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
+	pushd gcov_preload
+	dpkg-buildpackage -rfakeroot -d -b -us -uc -j$(SONIC_CONFIG_MAKE_JOBS)
+	popd
+	mv $* $(DEST)/