Ruby » Ruby master

mkmf.rb: add TARGET_NAME

• configure.in (DLDFLAGS): use TARGET_ENTRY to specify an entry point
  instead of TARGET which may contain non-identifer characters.
• lib/mkmf.rb (create_makefile): add TARGET_NAME which is the first
  part consists of only word characters. [ruby-core:46248][Bug #6709]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36338 b2dd03c8-39d4-4d8f-98ff-823fe69b080e