Miscellaneous improvements for GCC 4.8
Miscellaneous improvements for GCC 4.8

* Configure options improvements.
  - Enable checking as release.
  - Enable libstdc++ time.

jimhe/homebrew-versions,Ashton-W/homebrew-versions,heuermh/homebrew-versions,DomT4/homebrew-versions,UniqMartin/homebrew-versions,coeligena/homebrew-verscustomized