build: Show a note when building wihout libbsd

Show a note that when libbsd is not installed CRIU is compiled without
setproctitle() and strlcpy() support.
Signed-off-by: Radostin Stoyanov <rstoyanov1@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>

Makefile.config

@@ -5,6 +5,9 @@ include scripts/feature-tests.mak
 ifeq ($(call try-cc,$(FEATURE_TEST_LIBBSD_DEV),-lbsd),true)
         LIBS_FEATURES	+= -lbsd
         FEATURE_DEFINES	+= -DCONFIG_HAS_LIBBSD
+else
+        $(info Note: Building without setproctitle() and strlcpy() support.)
+        $(info $(info)      To enable these features, please install libbsd-devel (RPM) / libbsd-dev (DEB).)
 endif
 
 ifeq ($(call pkg-config-check,libselinux),y)