Bump toolchain JLLs (NEO 26.18, Level Zero loader 1.29). (#581)

NEO_jll 25.44 -> 26.18.38308 and oneAPI_Level_Zero_Loader_jll 1.25 -> 1.29,
which also pulls in newer gmmlib (22.10), libigc (2.34.4) and Level Zero
headers (1.16).

The Level Zero loader stopped probing for the default driver library name in
v1.29, so it no longer auto-discovers the NEO driver shipped in our artifacts
(zeDriverGet returns no drivers). Point it at the driver explicitly via
ZE_ENABLE_ALT_DRIVERS, unless the user already set it.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: maleadt

Project.toml

@@ -41,15 +41,15 @@ GPUCompiler = "1.6"
 GPUToolbox = "0.1, 0.2, 0.3, 1"
 KernelAbstractions = "0.9.39"
 LLVM = "6, 7, 8, 9"
-NEO_jll = "=25.44.36015"
+NEO_jll = "=26.18.38308"
 Preferences = "1"
 SPIRVIntrinsics = "0.5"
 SPIRV_LLVM_Translator_jll = "21"
 SPIRV_Tools_jll = "2025.4.0"
 SpecialFunctions = "1.3, 2"
 StaticArrays = "1"
 julia = "1.10"
-oneAPI_Level_Zero_Loader_jll = "1.25"
+oneAPI_Level_Zero_Loader_jll = "1.29"
 oneAPI_Support_jll = "0.9.2"
 
 [extras]

lib/level-zero/oneL0.jl

@@ -158,6 +158,12 @@ function __init__()
                       If you have a local oneAPI toolchain, you can use that; refer to the documentation for more details."""
             return
         end
+
+        # starting with v1.29, the Level Zero loader no longer probes for the default
+        # driver library name, so explicitly point it at the NEO driver from our artifacts.
+        if !haskey(ENV, "ZE_ENABLE_ALT_DRIVERS")
+            ENV["ZE_ENABLE_ALT_DRIVERS"] = NEO_jll.libze_intel_gpu
+        end
     end
 
     try