Metamake finds wrong gcc/g++ WSU Grid (and possibly others) if icc/icpc isn't in the path

[GregorySchwing]

Describe the bug
In metamake.sh, the path to icc and icpc is queries through a "which icc" shell command. The output is captured and if empty, the gnu compiler is used. Since the output of the which command is non-empty but also not a path (/usr/bin/which: no icc in (...)), the script doesn't search the path for gcc and g++, (which gcc), which is version 7.3, and cmake then finds the wrong version of gcc/g++ version 4.8.

To Reproduce
login to the grid
srun -q debug -t 10:0 --pty bash
git clone https://github.com/GOMC-WSU/GOMC.git
cd GOMC
git checkout development
./metamake.sh

Expected behavior
Compile with gcc/g++ 7.3

Additional context
Other softwares require a ./config script to set the compiler variables and other environment variables. This would prevent inevitable errors in autodetection.