package/gdb: extract Xtensa overlay as post-extract hook

... like it is done for gcc.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gdb/gdb.mk

@@ -45,11 +45,11 @@ HOST_GDB_INSTALL_OPTS += MAKEINFO=true install
 
 # Apply the Xtensa specific patches
 ifneq ($(ARCH_XTENSA_CORE_NAME),)
-define GDB_XTENSA_PRE_PATCH
+define GDB_XTENSA_OVERLAY_EXTRACT
 	$(call arch-xtensa-overlay-extract,$(@D),gdb)
 endef
-GDB_PRE_PATCH_HOOKS += GDB_XTENSA_PRE_PATCH
-HOST_GDB_PRE_PATCH_HOOKS += GDB_XTENSA_PRE_PATCH
+GDB_POST_EXTRACT_HOOKS += GDB_XTENSA_OVERLAY_EXTRACT
+HOST_GDB_POST_EXTRACT_HOOKS += GDB_XTENSA_OVERLAY_EXTRACT
 endif
 
 ifeq ($(GDB_FROM_GIT),y)