ac: get tcc_harvested from the kernel

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
diff --git a/meson.build b/meson.build
index 180401c..7eed531 100644
--- a/meson.build
+++ b/meson.build
@@ -1286,7 +1286,7 @@
 dep_libdrm_nouveau = null_dep
 dep_libdrm_intel = null_dep
 
-_drm_amdgpu_ver = '2.4.99'
+_drm_amdgpu_ver = '2.4.100'
 _drm_radeon_ver = '2.4.71'
 _drm_nouveau_ver = '2.4.66'
 _drm_intel_ver = '2.4.75'