merge revision(s) 60d0421c,b6534691,409dbc95,842b0008: [Backport #18191]

	Fix the encoding of loaded feature names [Bug #18191]

	The feature names loaded from the default load paths should also
	be in the file system encoding.
	---
	 ruby.c                    | 12 +++++++++++-
	 test/ruby/test_require.rb | 22 ++++++++++++++++++++++
	 2 files changed, 33 insertions(+), 1 deletion(-)

	Copy path strings as interned strings

	---
	 ruby.c | 12 ++++++++++--
	 1 file changed, 10 insertions(+), 2 deletions(-)

	Replace expanded load path only when modified

	---
	 ruby.c | 6 +++++-
	 1 file changed, 5 insertions(+), 1 deletion(-)

	Skip broken strings as the locale encoding

	---
	 internal/string.h |  1 +
	 ruby.c            | 11 +++++++----
	 string.c          |  6 ++++++
	 3 files changed, 14 insertions(+), 4 deletions(-)