[Bug target/63810] gcc sets incorrect macro for OS X deployment targets

[larryv at macports dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63810

--- Comment #5 from Lawrence Velázquez <larryv at macports dot org> ---
Created attachment 33970
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33970&action=edit
patch against 4.8 branch for handling deployment targets correctly

This patch incorporates and supersedes attachment 33932 from bug 61407.