[depends] Remove OBJCXX define from config.site.in

Author: fanquake

depends/config.site.in

@@ -63,7 +63,6 @@ LDFLAGS="-L$depends_prefix/lib $LDFLAGS"
 CC="@CC@"
 CXX="@CXX@"
 OBJC="${CC}"
-OBJCXX="${CXX}"
 CCACHE=$depends_prefix/native/bin/ccache
 PYTHONPATH=$depends_prefix/native/lib/python/dist-packages:$PYTHONPATH