Update "Revert "objtool: Fix CONFIG_STACK_VALIDATION=y warning for ..."

Part of the section we move was moved upstream in 4.19.15 by commit
ae206a1a5e3a "kbuild: fix false positive warning/error about missing
libelf".  Don't duplicate that section.

debian/changelog

@@ -381,6 +381,8 @@ linux (4.19.20-1) UNRELEASED; urgency=medium
   * percpu: convert spin_lock_irq to spin_lock_irqsave (fixes boot failure with
     alpha-generic flavour)
   * debian/tests/python: Fix spurious failure due to misuse of stderr
+  * Update "Revert "objtool: Fix CONFIG_STACK_VALIDATION=y warning for ..."
+    to not duplicate the conditional warning/error
 
   [ Marcin Juszkiewicz ]
   * [arm64] enable ARM_CCI_PMU so ARM_CCI400_PMU and ARM_CCI5xx_PMU options

debian/patches/debian/revert-objtool-fix-config_stack_validation-y-warning.patch

@@ -7,8 +7,8 @@ This reverts commit 9f0c18aec620bc9d82268b3cb937568dd07b43ff.  This
 check doesn't make sense for OOT modules as they should always use
 a pre-built objtool.
 ---
- Makefile | 33 ++++++++++++++++-----------------
- 1 file changed, 16 insertions(+), 17 deletions(-)
+ Makefile | 22 +++++++++++-----------
+ 1 file changed, 11 insertions(+), 11 deletions(-)
 
 --- a/Makefile
 +++ b/Makefile
@@ -30,7 +30,7 @@ a pre-built objtool.
  
  ifeq ($(KBUILD_EXTMOD),)
  core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
-@@ -1110,6 +1099,22 @@ uapi-asm-generic:
+@@ -1110,6 +1099,17 @@ uapi-asm-generic:
  	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
  	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
  
@@ -40,11 +40,6 @@ a pre-built objtool.
 +  ifeq ($(has_libelf),1)
 +    objtool_target := tools/objtool FORCE
 +  else
-+    ifdef CONFIG_UNWINDER_ORC
-+      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
-+    else
-+      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
-+    endif
 +    SKIP_STACK_VALIDATION := 1
 +    export SKIP_STACK_VALIDATION
 +  endif