portconfigure.tcl: Rewrite cxx_stdlib handling to more closely resemble similar options, like "configure.pipe". (Namely, let configure.[obj]cxxflags be and add -stdlib while setting up the environment.)
portconfigure.tcl: Rewrite cxx_stdlib handling to more closely resemble
similar options, like "configure.pipe". (Namely, let
configure.[obj]cxxflags be and add -stdlib while setting up the
environment.)

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@110419 d073be05-634f-4543-b044-5fe20cf6d1d6

macports/macports-base,neverpanic/macports-base,macports/macports-base,danchr/macports-base,neverpanic/macports-base,danchr/macports-base