fix syntax for different gcc versions
fix syntax for different gcc versions

FFroehlich/AMICI,AMICI-developer/AMICI,paulstapor/AMICI,AMICI-developer/AMICI,paulstapor/AMICI,paulstapor/AMICI,paulstapor/AMICI,FFroehlich/AMICI,FFroehlich/AMICI,AMICI-developer/AMICI,AMICI-developer/AMICI,FFroehlich/AMICI