merge revision(s) 66811,66812,66816: [Backport #15522]

	mjit_worker.c: untangle CC_LIBS nesting

	This should have no impact.
	The CC_LIBS was too hard to read for human.

	I don't remember whether the order of -lmsvcrt and -lgcc matters or not,
	but I kept that for the best safety.

	mjit_worker.c: pass -lgcc to GCC platforms

	using `-nodefaultlibs -nostdlib`.

	I assume libgcc is needed when we use -nostdlib, and it's linked on some
	platforms but not linked on some platforms (like aarch64, and possibly
	AIX as well) as said in https://wiki.osdev.org/Libgcc :

	> You can link with libgcc by passing -lgcc when linking your kernel
	with your compiler. You don't need to do this unless you pass the
	-nodefaultlibs option (implied by -nostdlib)

	Also note that -nostdlib is not strictly needed (rather implied
	-nodefaultlibs is problematic for Gentoo like Bug#15513, which will be
	approached later) but helpful for performance. So I want to keep it for
	now.

	[Bug #15522]

	I'm not trying to add `-nodefaultlibs -nostdlib` for AIX in this commit
	because AIX RubyCI is dead right now, but I'll try to add them again
	once RubyCI is fixed.

	mjit_worker.c: try passing -nostdlib to AIX

	r66812 might have allowed this. Testing.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@66849 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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