Add missing PVS Studio Open Source comments.

Also avoid checking protobuf-c source and protobuf-c generated files.

src/Makefile.in

@@ -146,7 +146,7 @@ OBJS = conversation.o copy_file.o edit_open.o env_hooks.o exec.o exec_common.o \
        net_ifs.o parse_args.o preserve_fds.o signal.o sudo.o sudo_edit.o \
        suspend_nopty.o tcsetpgrp_nobg.o tgetpass.o ttyname.o utmp.o @SUDO_OBJS@
 
-IOBJS = $(OBJS:.o=.i) sesh.i
+IOBJS = $(OBJS:.o=.i) sesh.i sudo_intercept.i sudo_intercept_common.i
 
 POBJS = $(IOBJS:.i=.plog)
 

src/apparmor.c

@@ -16,6 +16,11 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
 #include <config.h>
 
 #ifdef HAVE_APPARMOR