upgrade llvm19 broke drm-6.1 kmod

It seems there are some additional constraints about non-existent 
directories that now count as errors ..

--- sync_file.o ---
cc  -O2 -pipe -fno-strict-aliasing -DLINUXKPI_VERSION=60100 
'-DKBUILD_MODNAME="dmabuf"' -DCONFIG_DRM_AMDGPU_CIK 
-DCONFIG_DRM_AMDGPU_SI -DCONFIG_DRM_AMD_DC -DCONFIG_DRM_AMD_DC_SI 
-DCONFIG_AMD_PMC -DCONFIG_DRM_I915_FORCE_PROBE='"*"' 
-DCONFIG_DRM_I915_REQUEST_TIMEOUT=20000 -DCONFIG_DRM_I915_CAPTURE_ERROR 
-DCONFIG_DRM_I915_USERFAULT_AUTOSUSPEND=250 
-DCONFIG_DRM_I915_STOP_TIMEOUT=100 -DCONFIG_DRM_I915_PREEMPT_TIMEOUT=640 
-DCONFIG_DRM_I915_HEARTBEAT_INTERVAL=2500 
-DCONFIG_DRM_I915_TIMESLICE_DURATION=1 
-DCONFIG_DRM_I915_MAX_REQUEST_BUSYWAIT=8000 
-DCONFIG_DRM_I915_FENCE_TIMEOUT=10000 -DCONFIG_DRM_MIPI_DSI 
-DCONFIG_DRM_PANEL_ORIENTATION_QUIRKS -DCONFIG_APERTURE_HELPERS 
-DCONFIG_DRM_FBDEV_EMULATION -DCONFIG_DRM_FBDEV_OVERALLOC=100 
-DCONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG -DCONFIG_BACKLIGHT_CLASS_DEVICE 
-DCONFIG_DEBUG_FS -DCONFIG_DMI -DCONFIG_FB -DCONFIG_MTRR -DCONFIG_PCI 
-DCONFIG_PM -DCONFIG_PM_SLEEP -DCONFIG_SMP -DCONFIG_SUSPEND 
-DCONFIG_ACPI -DCONFIG_ACPI_SLEEP -DCONFIG_X86 -DCONFIG_X86_PAT 
-DCONFIG_64BIT -DCONFIG_AS_MOVNTDQA -DCONFIG_COMPAT -DCONFIG_X86_64 
-DCONFIG_DRM_AMD_DC_DCN -DCONFIG_DRM_AMD_DC_DCN3_0 
-DCONFIG_DRM_AMD_DC_DCN3_01 -DCONFIG_DRM_AMD_DC_DCN3_02 
-DCONFIG_DRM_AMD_DC_DCN3_1  -Werror -D_KERNEL -DKLD_MODULE -nostdinc 
-I/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/gplv2/include 
-I/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/bsd/include 
-I/usr/src/sys/compat/linuxkpi/common/include 
-I/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include 
-I/usr/src/sys/compat/linuxkpi/dummy/include -include 
/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/obj/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/dmabuf/opt_global.h 
-I. -I/usr/src/sys -I/usr/src/sys/contrib/ck/include -fno-common 
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer 
-fdebug-prefix-map=./machine=/usr/src/sys/amd64/include 
-fdebug-prefix-map=./x86=/usr/src/sys/x86/include 
-fdebug-prefix-map=./i386=/usr/src/sys/i386/include     -MD 
-MF.depend.sync_file.o -MTsync_file.o -mcmodel=kernel -mno-red-zone 
-mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables 
-ffreestanding -fwrapv -fstack-protector -Wall -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Wcast-qual -Wundef 
-Wno-pointer-sign -D__printf__=__freebsd_kprintf__ 
-Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas 
-Wswitch -Wno-error=tautological-compare -Wno-error=empty-body 
-Wno-error=parentheses-equality -Wno-error=unused-function 
-Wno-error=pointer-sign -Wno-error=shift-negative-value 
-Wno-address-of-packed-member -Wno-format-zero-length   -mno-aes 
-mno-avx  -std=gnu99 -c 
/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/drivers/dma-buf/sync_file.c 
-o sync_file.o
--- dma-fence-chain.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- dma-fence.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- sync_file.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- dma-buf.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- dma-buf-kmod.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- dma-resv.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- dma-fence-unwrap.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- dma-fence-array.o ---
cc: error: no such include directory: 
'/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/linuxkpi/dummy/include' 
[-Werror,-Wmissing-include-dirs]
--- dma-resv.o ---
*** [dma-resv.o] Error code 1

make[1]: stopped making "all" in 
/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/dmabuf
--- sync_file.o ---
*** [sync_file.o] Error code 1

make[1]: stopped making "all" in 
/usr/ports/graphics/drm-61-kmod/work/drm-kmod-drm_v6.1.92_0/dmabuf
--- dma-fence-unwrap.o ---
*** [dma-fence-unwrap.o] Error code 1