devel/llvm-devel: fix packaging on powerpc64*

pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.msan.a:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.msan.a.syms:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.msan_cxx.a:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.msan_cxx.a.syms:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.tsan.a:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.tsan.a.syms:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.tsan.so:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.tsan_cxx.a:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/lib/powerpc64le-portbld-freebsd14.1/libclang_rt.tsan_cxx.a.syms:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/llvm-devel/work-default/stage/usr/local/llvm-devel/lib/clang/20/share/msan_ignorelist.txt:No such file or directory