Fix API incompatibility for ILU in superLU support

jacques FRANCrequested to merge
jacquesn7/eigen-fix-super-lu:fix-superlu-ilu into master

Reference issue

Fix issue #2949 (closed)

What does this implement/fix?

Introduce GlobalLU_t pointer in the encapsulated interface to superlu as for LU interface. Don't know though if a version check is needed. SuperLUv7.0.1 requires this interface. Maybe older version are not.

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