readline is also removed from sync target #629

Job	Run time
make (test-bundler-parallel, 50)	26m 47s
make (check, i686)	9m 22s
make (check, ubuntu-24.04-arm)	5m 35s
make (check, --enable-shared --enable-load-relative)	7m 30s
make (test-bundled-gems)	17m 10s
make (check, --disable-yjit)	7m 16s
make (check, cppflags=-DVM_CHECK_MODE)	8m 35s
make (check, ubuntu-24.04)	8m 57s
Ubuntu result	2s
	1h 31m 14s

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