Copy the correct libs when using local-rust-root

This fixes a segfault when configuring rust to use local-rust-root. The
libraries were renamed in the 0.6-0.7 transition, and the script was not copying
them all. I also removed the line referencing libcore (now libstd).

Author: g5pw

src/etc/local_stage0.sh

@@ -43,7 +43,7 @@ fi
 
 cp ${PREFIX}/bin/rustc ${TARG_DIR}/stage0/bin/
 cp ${PREFIX}/lib/rustc/${TARG_DIR}/${LIBDIR}/* ${TARG_DIR}/stage0/${LIBDIR}/
+cp ${PREFIX}/lib/libextra*${LIB_SUF} ${TARG_DIR}/stage0/${LIBDIR}/
 cp ${PREFIX}/lib/librust*${LIB_SUF} ${TARG_DIR}/stage0/${LIBDIR}/
-cp ${PREFIX}/lib/libcore*${LIB_SUF} ${TARG_DIR}/stage0/${LIBDIR}/
 cp ${PREFIX}/lib/libstd*${LIB_SUF} ${TARG_DIR}/stage0/${LIBDIR}/
 cp ${PREFIX}/lib/libsyntax*${LIB_SUF} ${TARG_DIR}/stage0/${LIBDIR}/