configure.in: adjust libdirname

* configure.in (libdirname): adjust library path name which libruby
  files will be installed.  [Bug #7874]
* tool/rbinstall.rb (libdir): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39333 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: target_os suffix

* configure.in (target_os): do not strip -gnu suffix on Linux if
  --target is given explicitly.  [Bug #7874]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39334 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
ruby.h: HAVE_RB_SCAN_ARGS_OPTIONAL_HASH

* include/ruby/ruby.h (HAVE_RB_SCAN_ARGS_OPTIONAL_HASH): for
  rb_scan_args() optional hash feature.  [Bug #7861]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39335 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
extmk.rb: rename variables

* ext/extmk.rb: rename working variables as more descriptive so no
  shadowing local variable warnings, and remove unused variables.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39336 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
extmk.rb: extract SUBMAKEOPTS

* ext/extmk.rb (SUBMAKEOPTS): extract common sub make options.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39337 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* tool/rbinstall.rb (libdir): fix typo.  [Bug #7874]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39338 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
common.mk: uninstall

* common.mk (uninstall): uninstall installed file listed in
  $(INSTALLED_LIST) file.

* tool/rbuninstall.rb: simple uninstallation tool.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39339 b2dd03c8-39d4-4d8f-98ff-823fe69b080e