UBUNTU: SAUCE: Makefile: Remove inclusion of lbm header files

We haven't produced linux-headers-lbm packages in ages so stop trying
to include their header files.

Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Acked-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

Makefile

@@ -535,13 +535,6 @@ RUSTFLAGS_KERNEL =
 AFLAGS_KERNEL	=
 LDFLAGS_vmlinux =
 
-# Prefer linux-backports-modules
-ifneq ($(KBUILD_SRC),)
-ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
-UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
-endif
-endif
-
 # Use USERINCLUDE when you must reference the UAPI directories only.
 USERINCLUDE    := \
 		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
@@ -554,7 +547,6 @@ USERINCLUDE    := \
 # Use LINUXINCLUDE when you must reference the include/ directory.
 # Needed to be compatible with the O= option
 LINUXINCLUDE    := \
-		$(UBUNTUINCLUDE) \
 		-I$(srctree)/arch/$(SRCARCH)/include \
 		-I$(objtree)/arch/$(SRCARCH)/include/generated \
 		$(if $(building_out_of_srctree),-I$(srctree)/include) \