8371626: [linux] use icf=all for linking libraries

[MBaesken]

Identical code folding can reduce the size of some libs, especially libjvm. However not all linkers support the flag/feature so we have to limit it to some environments.
See for example this manpage :
https://manpages.debian.org/testing/lld-7/ld.lld-7.1

sizes of libjvm.so with / without -icf=all
linux aarch64 : 25888 / 27112 K
linux x86_64 : 27952 / 29072 K

(for most other native libs the identical code folding has no effect, because there is nothing to fold)

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• JDK-8371626: [linux] use icf=all for linking libraries (Enhancement - P4)

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