Build on MacOS 10.9 (once again)

Matthias

Hi all,

while I promised to provide a patch to make KLayout build on MacOS 10.9 too, I missed one line for 0.23.2. clang/LLVM will complain about ambiguities otherwise.

Please replace line 570 in gsiExpression.cc by

out.back () = (const R &) *i;

That should fix the build issues. Strange enough, clang/LLVM 3.0 does not complain on Linux ...

Matthias