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import-object: Avoid integer truncation on 32-bit platforms

The build fails when compiling for 32-bit platforms with
-Werror=incompatible-pointer-types:

  CFLAGS="-m32 -march=i686 -Werror=incompatible-pointer-types -Werror=implicit -Werror=int-conversion" setarch i686 -- meson setup _build
  setarch i686 -- meson compile -C _build -v
  ...

  ../p11-kit/import-object.c: In function ‘add_attrs_pubkey_rsa’:
  ../p11-kit/import-object.c:223:62: error: passing argument 3 of ‘p11_asn1_read’ from incompatible pointer type [-Werror=incompatible-pointer-types]
    223 |         attr_modulus.pValue = p11_asn1_read (asn, "modulus", &attr_modulus.ulValueLen);
        |                                                              ^~~~~~~~~~~~~~~~~~~~~~~~
        |                                                              |
        |                                                              long unsigned int *

Reported by Sam James in:
https://github.com/p11-glue/p11-kit/issues/608

Signed-off-by: Daiki Ueno <ueno@gnu.org>

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