screen uses cc instead of ${configure.cc}

[ryandesign@…]

screen is not ensuring it is UsingTheRightCompiler:

[snip]
--->  Building screen
DEBUG: Executing org.macports.build (screen)
DEBUG: Environment: MACOSX_DEPLOYMENT_TARGET='10.6'
DEBUG: Assembled command: 'cd "/opt/local/var/macports/build/_Users_rschmidt_macports_dports_sysutils_screen/work/screen-4.0.3" && /usr/bin/nice -n 10 /usr/bin/make -j1 all'
CPP="/usr/bin/gcc-4.2 -E -I/opt/local/include" srcdir=. sh ./osdef.sh
AWK=gawk srcdir=. sh ./comm.sh
cc -E -I. -I. ./comm.c
cc: Error: You should be using ${configure.cc}
See http://trac.macports.org/wiki/UsingTheRightCompiler
[snip]

[ryandesign@…]

Fixed in r62351.