freetype: freetype-patch: depends on host-automake

The "make freetype-patch" fails because does not found autogen.sh,
because autogen.sh available only for the configure stage.
To fix this add host-automake as a prerequisite to freetype-patch.

This change also fix the support to top-level parallel make.

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Cc: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>