Reduce binary size

- Only enable `HWY_AVX2` and `HWY_SSE2` (baseline) on x86.
- Only enable `HWY_NEON_WITHOUT_AES` (baseline) on AArch64.
- Ensure fallback emulation targets are always disabled.
- Add patch to disable `HWY_AVX10_2` target.

Author: kleisauke

build/libjxl.mk

@@ -21,6 +21,26 @@ define $(PKG)_BUILD
         -DJPEGXL_ENABLE_OPENEXR=OFF \
         -DJPEGXL_ENABLE_SKCMS=OFF \
         -DJPEGXL_ENABLE_TRANSCODE_JPEG=OFF \
+        $(if $(call seq,aarch64,$(PROCESSOR)), \
+            -DJPEGXL_ENABLE_HWY_SVE2_128=OFF \
+            -DJPEGXL_ENABLE_HWY_SVE_256=OFF \
+            -DJPEGXL_ENABLE_HWY_SVE2=OFF \
+            -DJPEGXL_ENABLE_HWY_SVE=OFF \
+            -DJPEGXL_ENABLE_HWY_NEON_BF16=OFF \
+            -DJPEGXL_ENABLE_HWY_NEON=OFF \
+            -DJPEGXL_ENABLE_HWY_NEON_WITHOUT_AES=ON \
+        $(else), \
+            -DJPEGXL_ENABLE_HWY_AVX10_2=OFF \
+            -DJPEGXL_ENABLE_HWY_AVX3_SPR=OFF \
+            -DJPEGXL_ENABLE_HWY_AVX3_ZEN4=OFF \
+            -DJPEGXL_ENABLE_HWY_AVX3_DL=OFF \
+            -DJPEGXL_ENABLE_HWY_AVX3=OFF \
+            -DJPEGXL_ENABLE_HWY_AVX2=ON \
+            -DJPEGXL_ENABLE_HWY_SSE4=OFF \
+            -DJPEGXL_ENABLE_HWY_SSSE3=OFF \
+            -DJPEGXL_ENABLE_HWY_SSE2=ON) \
+        -DJPEGXL_ENABLE_HWY_EMU128=OFF \
+        -DJPEGXL_ENABLE_HWY_SCALAR=OFF \
         -DJPEGXL_FORCE_SYSTEM_BROTLI=ON \
         -DJPEGXL_FORCE_SYSTEM_LCMS2=ON \
         -DJPEGXL_FORCE_SYSTEM_HWY=ON \

build/patches/libjxl-0.12-fixes.patch

@@ -0,0 +1,26 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Kleis Auke Wolthuizen <github@kleisauke.nl>
+Date: Mon, 8 Dec 2025 19:41:56 +0100
+Subject: [PATCH 1/1] Allow disabling the `HWY_AVX10_2` target
+
+Upstream-Status: Inappropriate [other]
+Requires Highway 1.3.0 or later, will fail on earlier versions with:
+```
+error: use of undeclared identifier 'HWY_AVX10_2'
+```
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1111111..2222222 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -132,8 +132,8 @@ else()
+   set(ENABLE_SKCMS_DEFAULT YES)
+ endif()
+ 
+-set(JPEGXL_HWY_TARGETS AVX2 AVX3 AVX3_DL AVX3_SPR AVX3_ZEN4 EMU128 NEON NEON_BF16 NEON_WITHOUT_AES PPC10 PPC8 PPC9 RVV SCALAR SSE2 SSE4 SSSE3 SVE SVE_256 SVE2 SVE2_128 WASM WASM_EMU256 Z14 Z15)
+-set(JPEGXL_HWY_TARGETS_OFF_BY_DEFAULT AVX3 AVX3_SPR AVX3_ZEN4 RVV SSSE3 SVE_256)
++set(JPEGXL_HWY_TARGETS AVX2 AVX3 AVX3_DL AVX3_SPR AVX3_ZEN4 AVX10_2 EMU128 NEON NEON_BF16 NEON_WITHOUT_AES PPC10 PPC8 PPC9 RVV SCALAR SSE2 SSE4 SSSE3 SVE SVE_256 SVE2 SVE2_128 WASM WASM_EMU256 Z14 Z15)
++set(JPEGXL_HWY_TARGETS_OFF_BY_DEFAULT AVX3 AVX3_SPR AVX3_ZEN4 AVX10_2 RVV SSSE3 SVE_256)
+ if (NOT CXX_SVE_SUPPORTED)
+   list(APPEND JPEGXL_HWY_TARGETS_OFF_BY_DEFAULT SVE SVE2 SVE_256 SVE2_128)
+ endif()