Update to llvm20

Author: ls-1801

.github/workflows/build.yml

@@ -60,6 +60,7 @@ jobs:
           test -n "$(docker image ls -q nes_clang_build_${{ matrix.osversion }})" && \
           docker image rm $(docker image ls -q nes_clang_build_${{ matrix.osversion }}) || \
           true
+
   build-arm-linux:
     env:
       VCPKG_DEP_LIST: arm64-linux
@@ -68,8 +69,8 @@ jobs:
     strategy:
       matrix:
         osversion: [ubuntu-22.04]
-        stdlib: [libc++, stdlibc++]
-        sanitizer: [null, 'Address', 'Thread', 'Undefined']
+        stdlib: [libc++]
+        sanitizer: [null]
     steps:
       - uses: AutoModality/action-clean@v1
       - uses: actions/checkout@v2

build_ubuntu-arm64.sh

@@ -21,10 +21,10 @@ local CXX_FLAGS=""
 local LINKER_FLAGS=""
 local ADDITIONAL_FLAGS=""
 if [ "$STDLIB" == "libc++" ]; then
-    CXX_FLAGS="-stdlib=libc++ -std=c++20"
+    CXX_FLAGS="-std=c++23 -stdlib=libc++"
     LINKER_FLAGS="-lc++"
 elif [ "$STDLIB" == "stdlibc++" ]; then
-    CXX_FLAGS="-std=c++20"
+    CXX_FLAGS="-std=c++23"
     LINKER_FLAGS=""
 else
     echo "Error: STDLIB env not set to either libc++ or stdlibc++."