Revert "package/zip: install to staging"

This reverts commit c5b5b5ccabe35e11f0ca8db4361bb3f335fc59fb.

Commit "c5b5b5ccab package/zip: install to staging" contains a typo that
prevents installing to staging.
ZIP_INSTALLING_STAGING_CMDS -> ZIP_INSTALL_STAGING_CMDS

But the package does not install headers or libraries, only ELF and
manual files.
So instead of fixing the install to staging, revert the bogus commit.

Cc: Jan Pedersen <jp@jp-embedded.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/zip/zip.mk

@@ -11,7 +11,6 @@ ZIP_SITE = ftp://ftp.info-zip.org/pub/infozip/src
 ZIP_LICENSE = Info-ZIP
 ZIP_LICENSE_FILES = LICENSE
 ZIP_CPE_ID_VENDOR = info-zip_project
-ZIP_INSTALL_STAGING = YES
 
 ifeq ($(BR2_PACKAGE_BZIP2),y)
 ZIP_DEPENDENCIES += bzip2
@@ -41,11 +40,6 @@ define ZIP_INSTALL_TARGET_CMDS
 		prefix=$(TARGET_DIR)/usr
 endef
 
-define ZIP_INSTALLING_STAGING_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D) -f unix/Makefile install \
-		prefix=$(STAGING_DIR)/usr
-endef
-
 define HOST_ZIP_BUILD_CMDS
 	$(HOST_MAKE_ENV) $(MAKE) $(HOST_CONFIGURE_OPTS) -C $(@D) \
 		CFLAGS="$(HOST_CFLAGS) $(ZIP_CFLAGS)" \