Norm2 intrinsic and XL compiler

Nicolas Tancogne-Dejeanrequested to merge
fix_norm2_xl_compiler into main

Description

The XL compiler does not support the norm2 intrinsic function of Fortran2008. This commit creates a workaround this problem by defining it internally when the function is not present.

News snippet

Allow for compiling Octopus Maya with the XL compiler.

Edited by Nicolas Tancogne-Dejean

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