merge revision(s) 0168094,cdef17096c03099f17ecf0af51f43faa0944f96d,b7…

…d86e330c76b4f9615511307e1c40f4f2937c83:

	Use libSystem.dylib instead of libm.dylib and libc.dylib

	  Because macOS 11.0(Big Sur) was removed libc and libm from `/usr/lib`.

	libSystem.dylib is also symlink. Use libSystem.B.dylib

	Workaroud for macOS Big Sur(11.0)

freeze all Range objects.

Matz want to try to freeze all Range objects.
[Feature #15504]

v2.7.1p83

add tag v2_6_6

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_6_6@67876 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

add tag v2_5_8

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_5_8@67882 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

add tag v2_4_10

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_4_10@67879 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

[ruby/reline] Version 0.1.2

ruby/reline@b41024e317

compile.c: avoid newarraykwsplat for arguments

`foo(*rest, post, **empty_kw)` is compiled like
`foo(*rest + [post, **empty_kw])`, and `**empty_kw` is removed by
"newarraykwsplat" instruction.
However, the method call still has a flag of KW_SPLAT, so "post" is
considered as a keyword hash, which caused a segfault.
Note that the flag cannot be removed if "empty_kw" is not always empty.

This change fixes the issue by compiling arguments with "newarray"
instead of "newarraykwsplat".

[Bug #16442]

* 2019-12-18 [ci skip]

Show include directive differences only when under git

When building from tarballs, the source directory is not a git
repository.