gcc: fix xtensa overlay application

gcc build scripts use wrong variable name to specify xtensa overlay
application command. As a result gcc is built with the default overlay,
which leads to obscure failures later in the build process.

xtensa toolchain needs an additional configuration for a specific core
variant we're building for. This configuration is called 'overlay' and
is an archive with files for binutils, gcc and gdb that replace
corresponding files in toolchain components.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gcc/gcc-final/gcc-final.mk

@@ -15,7 +15,7 @@ HOST_GCC_FINAL_DEPENDENCIES = \
 HOST_GCC_FINAL_EXTRACT_CMDS = $(HOST_GCC_EXTRACT_CMDS)
 
 ifneq ($(call qstrip, $(BR2_XTENSA_CORE_NAME)),)
-HOST_GCC_FINAL_POST_EXTRACT_CMDS += HOST_GCC_FINAL_XTENSA_OVERLAY_EXTRACT
+HOST_GCC_FINAL_POST_EXTRACT_HOOKS += HOST_GCC_XTENSA_OVERLAY_EXTRACT
 endif
 
 HOST_GCC_FINAL_POST_PATCH_HOOKS += HOST_GCC_APPLY_PATCHES

package/gcc/gcc-initial/gcc-initial.mk

@@ -13,7 +13,7 @@ HOST_GCC_INITIAL_DEPENDENCIES = $(HOST_GCC_COMMON_DEPENDENCIES)
 HOST_GCC_INITIAL_EXTRACT_CMDS = $(HOST_GCC_EXTRACT_CMDS)
 
 ifneq ($(call qstrip, $(BR2_XTENSA_CORE_NAME)),)
-HOST_GCC_INITIAL_POST_EXTRACT_CMDS += HOST_GCC_XTENSA_OVERLAY_EXTRACT
+HOST_GCC_INITIAL_POST_EXTRACT_HOOKS += HOST_GCC_XTENSA_OVERLAY_EXTRACT
 endif
 
 HOST_GCC_INITIAL_POST_PATCH_HOOKS += HOST_GCC_APPLY_PATCHES

package/gcc/gcc-intermediate/gcc-intermediate.mk

@@ -15,7 +15,7 @@ HOST_GCC_INTERMEDIATE_DEPENDENCIES = \
 HOST_GCC_INTERMEDIATE_EXTRACT_CMDS = $(HOST_GCC_EXTRACT_CMDS)
 
 ifneq ($(call qstrip, $(BR2_XTENSA_CORE_NAME)),)
-HOST_GCC_INTERMEDIATE_POST_EXTRACT_CMDS += HOST_GCC_XTENSA_OVERLAY_EXTRACT
+HOST_GCC_INTERMEDIATE_POST_EXTRACT_HOOKS += HOST_GCC_XTENSA_OVERLAY_EXTRACT
 endif
 
 HOST_GCC_INTERMEDIATE_POST_PATCH_HOOKS += HOST_GCC_APPLY_PATCHES