Workaround for CrayVariablesCheckEiger with CPE 23.12

[lucamar]

CPE 23.12 replaced the environment variable CRAY_LIBSCI_PREFIX_DIR with CRAY_PE_LIBSCI_PREFIX and CRAY_PE_LIBSCI_PREFIX_DIR in the modulefile cray-libsci.
Additionally, the name of the gcc module loaded by PrgEnv-gnu is now gcc-native (see SPCI-236 for more details).

Therefore, the sanity patterns {envvar_prefix}_PREFIX and {envvar_prefix}_VERSION using envvar_prefix = self.cray_module.upper().replace('-', '_') do not work any longer for CrayVariablesCheckEiger, since the envvar prefix should be CRAY_PE_LIBSCI for cray-libsci and GCC only for gcc-native.

I am providing a quick workaround that simply skips the check of cray-libsci and gcc for the time being.