package/skeleton-custom: simplify target/staging install

For target install, we don't need to check the merged-usr symlinks
any more, it was already checked before.

For staging, instead of creating directories, just copy the same
skeleton, which was already checked to be correct.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[Arnout: split off in a separate patch + wrote commit message]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/skeleton-custom/skeleton-custom.mk

@@ -85,24 +85,21 @@ $(error The custom skeleton in $(SKELETON_CUSTOM_PATH) is not \
 endif
 endif
 
+# The target-dir-warning file and the lib{32,64} symlinks are the only
+# things we customise in the custom skeleton.
 define SKELETON_CUSTOM_INSTALL_TARGET_CMDS
 	$(call SYSTEM_RSYNC,$(SKELETON_CUSTOM_PATH),$(TARGET_DIR))
-	$(call SYSTEM_USR_SYMLINKS_OR_DIRS,$(TARGET_DIR))
 	$(call SYSTEM_LIB_SYMLINK,$(TARGET_DIR))
 	$(INSTALL) -m 0644 support/misc/target-dir-warning.txt \
 		$(TARGET_DIR_WARNING_FILE)
 endef
 
-# For the staging dir, we don't really care about /bin and /sbin.
-# But for consistency with the target dir, and to simplify the code,
-# we still handle them for the merged or non-merged /usr cases.
-# Since the toolchain is not yet available, the staging is not yet
-# populated, so we need to create the directories in /usr
+# For the staging dir, we don't really care what we install, but we
+# need the /lib and /usr/lib appropriately setup. Since we ensure,
+# above, that they are correct in the skeleton, we can simply copy the
+# skeleton to staging.
 define SKELETON_CUSTOM_INSTALL_STAGING_CMDS
-	$(INSTALL) -d -m 0755 $(STAGING_DIR)/usr/lib
-	$(INSTALL) -d -m 0755 $(STAGING_DIR)/usr/bin
-	$(INSTALL) -d -m 0755 $(STAGING_DIR)/usr/sbin
-	$(call SYSTEM_USR_SYMLINKS_OR_DIRS,$(STAGING_DIR))
+	$(call SYSTEM_RSYNC,$(SKELETON_CUSTOM_PATH),$(STAGING_DIR))
 	$(call SYSTEM_LIB_SYMLINK,$(STAGING_DIR))
 endef