tdf#165433 Fix PDF imports with (system) poppler >= 25.02.0

tdf#165433 Fix PDF imports with (system) poppler >= 25.02.0

Since poppler 25.02.0, GlobalParams doesn't have a constructor
that accepts a nullptr anymore,
see upstream poppler b50390f748b59cb0a64b912636ecf6527bd0d12a commit.

As such, the data directory location defined for SYSTEM_POPPLER
needs to be updated accordingly (when SYSTEM_POPPLER >= 25.02.0),
otherwise PDF imports fail with
"General Error / General input/output error".

Change-Id: I2a60b03a9ae20aab8d36db2a6827f1f3b9618115
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/182282
Tested-by: Jenkins
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
Gbp-Pq: Name poppler-25.02.diff