Include header file for function prototypes hcache_init, hcache_done.
Note that include order is important, i.e. include has to be placed after the lists.h and rules.h includes.
Change-Id: Ic8a286662c8267bdfd19011b5ed8e825ee16d7ee
Reviewed-on: https://review.haiku-os.org/c/buildtools/+/4396
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
