build: fix Makefile parse.h dependency clauses.

The current clauses stating "main.c: parse.h" and "yylex.c: parse.h" do
not work as expected. Make did not try to build parse.h upon building
flex-main.o as it would think main.c exist already and ignore the
clause. Fix this by explicitly stating that the .o files depend on
parse.h instead.

This dependency bug only happens if user builds flex from a
checked-out repository.

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