dkms mkdsc template should not change access rights of upstream source

The Makefile of the mkdsk/mkdeb template is changing the accessrights in the source to 644.

template-dkms-mkdsc/Makefile:
...
#source tree
ifeq ("$(wildcard $(NAME)-$(VERSION))", "$(NAME)-$(VERSION)")
        install -d "$(SRC)"
        cp -a $(NAME)-$(VERSION) $(SRC)
        chmod 644 -R "$(SRC)/$(NAME)-$(VERSION)"
endif

should be
#source tree
ifeq ("$(wildcard $(NAME)-$(VERSION))", "$(NAME)-$(VERSION)")
        install -d "$(SRC)"
        cp -a $(NAME)-$(VERSION) $(SRC)
endif

The Makefile should not touch accessrights, causing breakage of the build, in case executables in the source are required for the build.