fix: update Clang architecture glob

[m-fol]

Suggested change (in clang.sh):

case "$ARCHITECTURE" in
  *x86_64*) LLVM_TARGETS_TO_BUILD=X86 ;;
  *x86-64*) LLVM_TARGETS_TO_BUILD=X86 ;;
  *arm64*) LLVM_TARGETS_TO_BUILD=AArch64 ;;
  *aarch64*) LLVM_TARGETS_TO_BUILD=AArch64 ;;
  *) echo "Unknown LLVM target for architecture" >&2; exit 1 ;;
esac

---

Building Clang leads to this error:
Corresponding Error Log

2026-03-16@17:20:16:DEBUG:LCG:Clang:0: ++ echo 'Arch: '\''x86_64-el10-gcc15-opt'\'''
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: ++ case $ARCHITECTURE in
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: ++ DEFAULT_SYSROOT=
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: ++ case $ARCHITECTURE in
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: ++ echo 'Unknown LLVM target for architecture'
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: Unknown LLVM target for architecture
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: ++ exit 1
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: + exit 1
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: + cleanup
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: + local exit_code=1
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: ++ date +%s
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: + BITS_END_TIMESTAMP=1773678016
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: + BITS_DELTA_TIME=0
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: + echo 'bits: done building Clang-v20.1.7-local1 at 1773678016 (0 s)'
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: bits: done building Clang-v20.1.7-local1 at 1773678016 (0 s)
2026-03-16@17:20:16:DEBUG:LCG:Clang:0: + exit 1
2026-03-16@17:20:16:ERROR:LCG:Clang:0: BUILD FAILED: Clang@v20.1.7
2026-03-16@17:20:16:ERROR:LCG:Clang:0: ======================================================================
2026-03-16@17:20:16:ERROR:LCG:Clang:0: 
2026-03-16@17:20:16:ERROR:LCG:Clang:0: Log File:
2026-03-16@17:20:16:ERROR:LCG:Clang:0:   ../sw/BUILD/Clang-latest/log
2026-03-16@17:20:16:ERROR:LCG:Clang:0: 
2026-03-16@17:20:16:ERROR:LCG:Clang:0: Build Directory:
2026-03-16@17:20:16:ERROR:LCG:Clang:0:   ../sw/BUILD/Clang-latest/Clang
2026-03-16@17:20:16:ERROR:LCG:Clang:0: 
2026-03-16@17:20:16:ERROR:LCG:Clang:0: Environment:
2026-03-16@17:20:16:ERROR:LCG:Clang:0:   OS: slc10_x86-64
2026-03-16@17:20:16:ERROR:LCG:Clang:0:   bits: 0.1.2.dev20+gc3b2285f4 (bits@0f04558898)

In this part of the error log, we can see that:

++ echo 'Arch: '\''x86_64-el10-gcc15-opt'\'''
++ case $ARCHITECTURE in

$ARCHITECTURE doesn't end in *_x86-64, but it begins with that, judging from the echo printout. Leading to the last case (echo 'Unknown LLVM target for architecture' >&2; exit 1 ;;).
Thus:

case "$ARCHITECTURE" in
  *_x86_64) LLVM_TARGETS_TO_BUILD=X86 ;;

Is updated with:

case "$ARCHITECTURE" in
  *x86_64*) LLVM_TARGETS_TO_BUILD=X86 ;;