Linux

Remove obsolete LGTM config file #2913

Job	Run time
check headers	3m 54s
build (asio-debugging=on picker-debugging=on)	30m 13s
build (extensions=off logging=off streaming=off super-seeding=off share-mode=off predictive-piece...	22m 38s
build (crypto=gcrypt)	26m 24s
clang-tidy	9m 57s
build (mmap-disk-io=off)	28m 43s
build dist (ubuntu-20.04)	17m 18s
Fuzzers	7m 58s
build dist (ubuntu-22.04)	16m 9s
pre-commit	39s
Simulations	18m 23s
Tests (address-sanitizer=norecover undefined-sanitizer=norecover crypto=openssl)	18m 22s
Tests (toolset=clang logging=off address-sanitizer=norecover undefined-sanitizer=norecover)	11m 28s
Tests (thread-sanitizer=norecover crypto=openssl release debug-symbols=on cxxflags=-Wno-tsan)	19m 44s
Tests (crypto=gnutls)	12m 9s
Tests (deprecated-functions=off)	10m 48s
	4h 14m 47s

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