Disable builds of GPTL inside Scorpio in E3SM builds

@amametjanov found that the GPTL library inside Scorpio is built when Scorpio is used inside E3SM.

When Scorpio is built inside E3SM it should be using the GPTL library built by CIME and hence should not be building the internal GPTL library. We do have CMake code to disable (not add gptl directory in the build) gptl builds when the GPTL library is found. Its likely that this code (detection of GPTL lib) is not working as expected and needs to be debugged and fixed.