Also allow intelfftw on GCCcore

Author: SebastianAchilles

easybuild/toolchains/fft/intelfftw.py

@@ -62,7 +62,7 @@ def _set_fftw_variables(self):
             compsuff = '_intel'
         elif get_software_root('PGI'):
             compsuff = '_pgi'
-        elif get_software_root('GCC'):
+        elif get_software_root('GCC') or get_software_root('GCCcore'):
             compsuff = '_gnu'
         else:
             error_msg = "Not using Intel compilers, PGI nor GCC, don't know compiler suffix for FFTW libraries."