package/freetype/freetype.mk: Add zib to dependencies

Looking into adding a configure cache to the build (like the GIT buildroot version)
This means that freetype needs to know about zlib so make
sure it had it as a dependency.
Also remove install rule for staging as it matches default.

Signed-off-by: Daniel Laird <daniel.j.laird@nxp.com>

package/freetype/freetype.mk

@@ -10,8 +10,7 @@ FREETYPE_LIBTOOL_PATCH = NO
 FREETYPE_INSTALL_STAGING = YES
 FREETYPE_INSTALL_TARGET = NO
 FREETYPE_MAKE_OPT = CCexe="$(HOSTCC)"
-FREETYPE_INSTALL_STAGING_OPT = DESTDIR=$(STAGING_DIR) install
-FREETYPE_DEPENDENCIES = uclibc pkgconfig
+FREETYPE_DEPENDENCIES = uclibc pkgconfig zlib
 
 $(eval $(call AUTOTARGETS,package,freetype))