* process.c (rb_execarg_parent_start1): new macro ALWAYS_NEED_ENVP

  to generate envp_str anytime on Solaris 10 (or earlier version
  of Solaris) to avoid calling execv() which is async-signal unsafe
  on Solaris 10. [Bug #11265] [ruby-dev:49089]
      
* process.c (exec_with_sh, proc_exec_cmd): On Solaris 10,
  because ALWAYS_NEED_ENVP is 1 and envp_str is always generated,
  execv() in exec_with_sh() and proc_exec_cmd() are never called.
  To guarantee this, execv() is replaced by a macro to print
  out error message on Solaris 10.
	      
* process.c (proc_exec_sh): Because proc_exec_sh() may be called
  by rb_proc_exec() with envp_str = Qfalse, execl() is replaced
  by a macro that calls execle() with "extern char **environ"
  traditional global variable on Solaris 10.
  TODO: This may be unsafe and sholud be changed
  in the future.
  Although rb_proc_exec() is not used from inside current version
  of ruby, it may be called by third-party extensions.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50977 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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