science/ALPSCore: fix build with GCC-based architectures

CMake Error at common/cmake/ALPSCommonModuleDefinitions.cmake:194 (target_compile_features):

target_compile_features The compiler feature "cxx_std_11" is not known to
CXX compiler

"GNU"

version 4.2.1.

Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D20049