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pam-extension: Avoid gnu-variable-sized-type-not-at-end warning

Marco Trevisan requested to merge 3v1n0/gdm:use-ptr-extension-data into main

I was running scan-build on this code and clang warns about this:

  pam-extensions/gdm-choice-list-pam-extension.h:36:32: error:
    field 'header' with variable sized type 'GdmPamExtensionMessage' not at
    the end of a struct or class is a GNU extension
    [-Werror,-Wgnu-variable-sized-type-not-at-end]

So just use a pointer to make this clearer

As per this, handle few more scan-build warnings. Most of issues it shows are false-negatives though, so I don't think it's needed to address them.

Edited by Marco Trevisan

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