perf tools: Fix LLVM download hint link

http://llvm.org/apt returns 404, it has moved to https://apt.llvm.org/Signed-off-by: NJames Clark <james.clark@arm.com>
Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: clang-built-linux@googlegroups.com
Link: http://lore.kernel.org/lkml/20210831145501.2135754-3-james.clark@arm.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/llvm-utils.c

@@ -234,7 +234,7 @@ version_notice(void)
 "     \t\tgit clone http://llvm.org/git/clang.git\n\n"
 "     \tOr fetch the latest clang/llvm 3.7 from pre-built llvm packages for\n"
 "     \tdebian/ubuntu:\n"
-"     \t\thttp://llvm.org/apt\n\n"
+"     \t\thttps://apt.llvm.org/\n\n"
 "     \tIf you are using old version of clang, change 'clang-bpf-cmd-template'\n"
 "     \toption in [llvm] section of ~/.perfconfig to:\n\n"
 "     \t  \"$CLANG_EXEC $CLANG_OPTIONS $KERNEL_INC_OPTIONS $PERF_BPF_INC_OPTIONS \\\n"