Makefile: end last line with newline character

(cherry picked from commit f6c84a2fb23a87a2735fe4c8e45b84383607532c)
Makefile: add target pdf for integration in vim-latex

(cherry picked from commit 1c80a6bfe96c288582468583935182715f0803e6)

Conflicts:
	Makefile
Makefile: mark phony targets

(cherry picked from commit ff04915e76adc9b809deec7b390dfb9ea7297fdb)