[Bug bpf/26234] utrace_derived_probes (and others?) being silently ignored by bpf backend

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=26234

--- Comment #2 from Serhei Makarov <me at serhei dot io> ---
40dbe72afa2 adds warnings for the other probe types
though in some cases they may still be overridden by earlier, more confusing
warnings

e.g. 
sudo stap --bpf -ve 'probe process("/bin/ls").insn { println("hello") exit() }'

Pass 1: parsed user script and 51 library scripts using
40640virt/23544res/9372shr/13872data kb, in 0usr/0sys/7real ms.
semantic error: while resolving probe point: identifier 'process' at
<input>:1:7
        source: probe process("/bin/ls").insn { println("hello", execname(),
pid()) }
                      ^

semantic error: while resolving probe point: identifier 'process' at :1:7
        source: probe process("/bin/ls").insn { println("hello", execname(),
pid()) }
                      ^

semantic error: process probes not available without kernel CONFIG_UTRACE

Pass 2: analyzed script: 0 probes, 0 functions, 0 embeds, 0 globals using
40640virt/23544res/9372shr/13872data kb, in 0usr/0sys/0real ms.
Pass 2: analysis failed.  [man error::pass2]

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