kernel: Use prebuilt binaries

perl, lz4c, and a bunch of other binaries are not allowed anymore.
So we need to provide our own.

Change-Id: Idbc88b76247b3dda7c5d52e5eed2d548c33f6f2d

build/soong/Android.bp

@@ -27,7 +27,7 @@ lineage_generator {
     name: "generated_kernel_includes",
 
     // The headers make command
-    cmd: "$(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(TARGET_KERNEL_SOURCE) O=$(genDir) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) headers_install",
+    cmd: "$(PATH_OVERRIDE_SOONG) $(KERNEL_MAKE_CMD) $(KERNEL_MAKE_FLAGS) -C $(TARGET_KERNEL_SOURCE) O=$(genDir) ARCH=$(KERNEL_ARCH) $(KERNEL_CROSS_COMPILE) headers_install",
 
     // Directories that can be imported by a cc_* module generated_headers property
     export_include_dirs: ["usr/include", "usr/techpack/audio/include"],

build/tasks/kernel.mk

@@ -187,6 +187,9 @@ ifeq ($(TARGET_KERNEL_MODULES),)
     TARGET_KERNEL_MODULES := INSTALLED_KERNEL_MODULES
 endif
 
+# System tools are no longer allowed on 10+
+PATH_OVERRIDE += $(TOOLS_PATH_OVERRIDE)
+
 KERNEL_ADDITIONAL_CONFIG_OUT := $(KERNEL_OUT)/.additional_config
 
 # Internal implementation of make-kernel-target

config/BoardConfigKernel.mk

@@ -121,6 +121,11 @@ ifneq ($(TARGET_KERNEL_ADDITIONAL_FLAGS),)
   KERNEL_MAKE_FLAGS += $(TARGET_KERNEL_ADDITIONAL_FLAGS)
 endif
 
+TOOLS_PATH_OVERRIDE := \
+    PATH=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_OS)-x86/bin:$$PATH \
+    LD_LIBRARY_PATH=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_OS)-x86/lib:$$LD_LIBRARY_PATH \
+    PERL5LIB=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_OS)-x86/lib/perl-base
+
 # Set DTBO image locations so the build system knows to build them
 ifeq ($(TARGET_NEEDS_DTBOIMAGE),true)
 BOARD_PREBUILT_DTBOIMAGE ?= $(PRODUCT_OUT)/dtbo/arch/$(KERNEL_ARCH)/boot/dtbo.img

config/BoardConfigSoong.mk

@@ -1,9 +1,12 @@
+PATH_OVERRIDE_SOONG := $(shell echo $(TOOLS_PATH_OVERRIDE) | sed -e 's|$$|$$$$|g')
+
 # Add variables that we wish to make available to soong here.
 EXPORT_TO_SOONG := \
     KERNEL_ARCH \
     KERNEL_CROSS_COMPILE \
     KERNEL_MAKE_CMD \
     KERNEL_MAKE_FLAGS \
+    PATH_OVERRIDE_SOONG \
     TARGET_KERNEL_CONFIG \
     TARGET_KERNEL_SOURCE