zlib: allow flat binary build

package/zlib/Makefile

@@ -20,12 +20,12 @@ $(eval $(call PKG_template,ZLIB,zlib,$(PKG_VERSION)-$(PKG_RELEASE),$(PKG_DEPENDS
 CONFIG_STYLE:=		manual
 CONFIGURE_ENV+=		uname=Linux
 
-ifeq ($(ADK_TARGET_USE_STATIC_LIBS),)
+ifeq ($(ADK_TARGET_BINFMT_FLAT)$(ADK_TARGET_USE_STATIC_LIBS),)
 CONFIGURE_OPTS:=	--shared
 endif
 
 ALL_TARGET:=		libz.a 
-ifeq ($(ADK_TARGET_USE_STATIC_LIBS),)
+ifeq ($(ADK_TARGET_BINFMT_FLAT)$(ADK_TARGET_USE_STATIC_LIBS),)
 ALL_TARGET+=		libz.so.$(PKG_VERSION)
 endif