OpenMolcas no MPI: use non-MPI toolchain

[JarneRenders]

(created using eb --new-pr)

[JarneRenders]

Again the -xHost issue on zen5 arch. Running again with our hooks that replace this with -march=rocketlake.

Test report by @JarneRenders
FAILED
Build succeeded for 0 out of 1 (total: 11 mins 36 secs) (1 easyconfigs in total)
node510.anansi.os - Linux Rocky Linux 9.8 (Blue Onyx), x86_64, AMD EPYC 9335 32-Core Processor, Python 3.9.25
See https://gist.github.com/JarneRenders/f5eecf26a0eb47e86271a308f896cb1d for a full test report.

[JarneRenders]

Test report by @JarneRenders
SUCCESS
Build succeeded for 1 out of 1 (total: 1 hour 19 mins 52 secs) (1 easyconfigs in total)
node510.anansi.os - Linux Rocky Linux 9.8 (Blue Onyx), x86_64, AMD EPYC 9335 32-Core Processor, Python 3.9.25
See https://gist.github.com/JarneRenders/36c863a533a20b892e87c313fc161b24 for a full test report.