shell32: only fill used pointers

[André Hentschel]

This is needed to bring up IE8. Otherwise there is a Backtrace:
=>0 0x7e80198d SHDefExtractIconW+0x7d(pszIconFile=0x32e310, iIndex=0, uFlags=0, phiconLarge=(nil), phiconSmall=0x32e30c, nIconSize=1048592)

---
  dlls/shell32/iconcache.c |    4 ++--
  1 files changed, 2 insertions(+), 2 deletions(-)


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