build system: delete generated files on "make mrproper"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/Makefile b/Makefile
index d9204f4..c58097d 100644
--- a/Makefile
+++ b/Makefile
@@ -963,10 +963,14 @@
 # Directories & files removed with 'make mrproper'
 MRPROPER_DIRS  += include/config include2
 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
+		  include/NUM_APPLETS.h \
 		  include/autoconf.h \
 		  include/bbconfigopts.h \
+		  include/bbconfigopts_bz2.h \
 		  include/usage_compressed.h \
 		  include/applet_tables.h \
+		  include/applets.h \
+		  include/usage.h \
 		  applets/usage \
 		  .kernelrelease Module.symvers tags TAGS cscope* \
 		  busybox_old