Fix up the Makefiles dependencies in lib/ext2fs and lib/quota

Fix up the Makefiles dependencies in lib/ext2fs and lib/quota

Also use angle brackets for the #include of dirpaths.h to avoid the
need to manually massage the Makefile.in for the util directory.  This
is needed because we have to create a fake dirpaths.h file in the util
directory.  The fake dirpaths.h file is rquired to break the circular
dependency caused by util/subst creating dirpaths.h, while
util/subst.c is including config.h, which includes dirpaths.h.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>