[release-1.10] Remove incomplete support for precompile configs

[IanButterworth]

Fixes this error on 1.10.8 reported by @fredrikekre
The error was introduced in backport #4107 but I'm not sure why tests didn't catch it as we do test for pidlocked precompilation

Pkg.jl/test/api.jl

Lines 235 to 261 in 6390ea9

	@testset "pidlocked precompile" begin
	proj = joinpath(pwd(), "packages", "SlowPrecompile")
	cmd = addenv(`$(Base.julia_cmd()) --color=no --startup-file=no --project="$(pkgdir(Pkg))" -e "
	using Pkg
	Pkg.activate(\"$(escape_string(proj))\")
	Pkg.precompile()
	"`,
	"JULIA_PKG_PRECOMPILE_AUTO" => "0")
	iob1 = IOBuffer()
	iob2 = IOBuffer()
	try
	Base.Experimental.@sync begin
	@async run(pipeline(cmd, stderr=iob1, stdout=iob1))
	@async run(pipeline(cmd, stderr=iob2, stdout=iob2))
	end
	catch
	println("pidlocked precompile tests failed:")
	println("process 1:\n", String(take!(iob1)))
	println("process 2:\n", String(take!(iob2)))
	rethrow()
	end
	s1 = String(take!(iob1))
	s2 = String(take!(iob2))
	@test occursin("Precompiling", s1)
	@test occursin("Precompiling", s2)
	@test any(contains("Being precompiled by another process (pid: "), (s1, s2))
	end

  ◐ PkgServer Being precompiled by another process (pid: 981928, pidfile: /home/fredrik/.julia/compiled/v1.10/PkgServer/6eohG_aD2qu.ji.pidfile)
        InfoUnhandled Task ERROR: MethodError: no method matching isprecompiled(::Base.PkgId; ignore_loaded::Bool, flags::Base.CacheFlags)

Closest candidates are:
  isprecompiled(::Base.PkgId; ignore_loaded, stale_cache, cachepaths, sourcepath) got unsupported keyword argument "flags"
   @ Base loading.jl:1459

Stacktrace:
 [1] kwerr(::@NamedTuple{ignore_loaded::Bool, flags::Base.CacheFlags}, ::Function, ::Base.PkgId)
   @ Base ./error.jl:165
 [2] (::Pkg.API.Precompilation.var"#77#79"{Pkg.API.Precompilation.var"#27#67"{Pipe, Dict{Base.PkgId, Base.PkgId}, Dict{Base.PkgId, Vector{Base.PkgId}}, String, Base.PkgId}, Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, String}, Base.CacheFlags, Base.PkgId})()
   @ Pkg.API.Precompilation ~/.julia/juliaup/julia-1.10.8+0.x64.linux.gnu/share/julia/stdlib/v1.10/Pkg/src/precompilation.jl:1073
 [3] mkpidlock(f::Pkg.API.Precompilation.var"#77#79"{Pkg.API.Precompilation.var"#27#67"{Pipe, Dict{Base.PkgId, Base.PkgId}, Dict{Base.PkgId, Vector{Base.PkgId}}, String, Base.PkgId}, Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, String}, Base.CacheFlags, Base.PkgId}, at::String, pid::Int32; kwopts::@Kwargs{stale_age::Int64})
   @ FileWatching.Pidfile ~/.julia/juliaup/julia-1.10.8+0.x64.linux.gnu/share/julia/stdlib/v1.10/FileWatching/src/pidfile.jl:93
 [4] #mkpidlock#6
   @ ~/.julia/juliaup/julia-1.10.8+0.x64.linux.gnu/share/julia/stdlib/v1.10/FileWatching/src/pidfile.jl:88 [inlined]
 [5] precompile_pkgs_maybe_cachefile_lock(f::Pkg.API.Precompilation.var"#27#67"{Pipe, Dict{Base.PkgId, Base.PkgId}, Dict{Base.PkgId, Vector{Base.PkgId}}, String, Base.PkgId}, io::IOContext{IO}, print_lock::ReentrantLock, fancyprint::Bool, pkg_config::Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, pkgspidlocked::Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, String}, hascolor::Bool)
   @ Pkg.API.Precompilation ~/.julia/juliaup/julia-1.10.8+0.x64.linux.gnu/share/julia/stdlib/v1.10/Pkg/src/precompilation.jl:1071
 [6] macro expansion
   @ ./timing.jl:395 [inlined]
 [7] (::Pkg.API.Precompilation.var"#24#64"{Bool, Bool, Vector{Task}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, String}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, IOBuffer}, Base.Event, Base.Event, ReentrantLock, Vector{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, String}, Vector{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}}, Vector{Base.PkgId}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, Bool}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, Base.Event}, Dict{Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}, Bool}, Vector{Base.PkgId}, Pkg.API.Precompilation.var"#describe_pkg#37"{Dict{Base.PkgId, Base.PkgId}, Pkg.API.Precompilation.var"#color_string#36"{Bool}, Int64}, Dict{Base.PkgId, Base.PkgId}, Dict{Base.PkgId, Vector{Base.PkgId}}, Dict{Tuple{Base.PkgId, UInt128, String, String}, Bool}, Pkg.API.Precompilation.var"#color_string#36"{Bool}, Bool, Base.Semaphore, Bool, String, Vector{String}, Vector{Base.PkgId}, Base.PkgId, Base.CacheFlags, Cmd, Pair{Cmd, Base.CacheFlags}, Tuple{Base.PkgId, Pair{Cmd, Base.CacheFlags}}})()
   @ Pkg.API.Precompilation ~/.julia/juliaup/julia-1.10.8+0.x64.linux.gnu/share/julia/stdlib/v1.10/Pkg/src/precompilation.jl:864