kernel: Remove macro definitions, pass variables using ccflags -y, and reapply manual su protection.

kernel: stop printing useless message unless its ddk environment
* In-tree build show empty KDIR

-- KDIR:
-- MDIR: /home/runner/work/KernelSU-Test/KernelSU-Test/kernel_414/KernelSU/kernel
  AR      drivers/iommu/built-in.o
  CC      drivers/input/misc/uinput.o
-- KernelSU version: 12329
-- KernelSU: CONFIG_KSU_MANUAL_HOOK
-- Supported KernelSU Manager(s): tiann, rsuntk, 5ec1cff
  CC      drivers/kernelsu/ksu.o
  AR      drivers/input/joystick/built-in.o
  CC      drivers/hid/hid-roccat-pyra.o

Co-authored-by: Faris <rissu.ntk@gmail.com>
Co-authored-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>

kernel/Makefile

@@ -13,7 +13,11 @@ kernelsu-objs += embed_ksud.o
 kernelsu-objs += kernel_compat.o
 kernelsu-objs += throne_comm.o
 kernelsu-objs += sulog.o
+
+ifeq ($(CONFIG_KSU_MANUAL_SU), y)
+ccflags-y += -DCONFIG_KSU_MANUAL_SU
 kernelsu-objs += manual_su.o
+endif
 
 ifeq ($(CONFIG_KSU_TRACEPOINT_HOOK), y)
 kernelsu-objs += ksu_trace.o
@@ -46,8 +50,10 @@ CURL_BIN := /usr/bin/env PATH="$$PATH":/usr/bin:/usr/local/bin curl
 KDIR := $(KDIR)
 MDIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
 
+ifneq ($(KDIR),)
 $(info -- KDIR: $(KDIR))
 $(info -- MDIR: $(MDIR))
+endif
 
 KSU_GITHUB_VERSION := $(shell $(CURL_BIN) -s "https://api.github.com/repos/$(REPO_OWNER)/$(REPO_NAME)/releases/latest" | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/')
 KSU_GITHUB_VERSION_COMMIT := $(shell $(CURL_BIN) -sI "https://api.github.com/repos/$(REPO_OWNER)/$(REPO_NAME)/commits?sha=$(REPO_BRANCH)&per_page=1" | grep -i "link:" | sed -n 's/.*page=\([0-9]*\)>; rel="last".*/\1/p')
@@ -120,10 +126,13 @@ endif
 
 ifeq ($(CONFIG_KSU_KPROBES_HOOK), y)
 $(info -- SukiSU: CONFIG_KSU_KPROBES_HOOK)
+ccflags-y += -DCONFIG_KSU_KPROBES_HOOK
 else ifeq ($(CONFIG_KSU_TRACEPOINT_HOOK), y)
 $(info -- SukiSU: CONFIG_KSU_TRACEPOINT_HOOK)
+ccflags-y += -DCONFIG_KSU_TRACEPOINT_HOOK
 else ifeq ($(CONFIG_KSU_MANUAL_HOOK), y)
 $(info -- SukiSU: CONFIG_KSU_MANUAL_HOOK)
+ccflags-y += -DCONFIG_KSU_MANUAL_HOOK
 endif
 
 KERNEL_VERSION := $(VERSION).$(PATCHLEVEL)
@@ -140,7 +149,6 @@ endif
 $(info -- KERNEL_VERSION: $(KERNEL_VERSION))
 $(info -- KERNEL_TYPE: $(KERNEL_TYPE))
 
-$(info -- KERNEL_VERSION: $(KERNEL_VERSION))
 ifeq ($(CONFIG_KPM), y)
 $(info -- KPM is enabled)
 else