Log Message:
Update emacs-snapshot to 24.0.50.20110408.

Patches provided by Makoto Fujiwara in PR 44871.

Changes:
- Fix problems found by GCC 4.6.0's static checks.
- man.el (Man-page-header-regexp): Solaris < 2.6 no longer supported.
- custom.el (load-theme): Minor optimization in assigning faces.
- emacs-lisp/package.el (package--with-work-buffer): Recognize https
  URLs.