Move Shell functions into util Due to a bug in mingw only one c file may include shlobj.h as there is an unguarded inline definition in there leading to multiple definition errors. Thus the get_program_data get_program_files utility functions.

aheinecke@intevation.de=Andre Heinecke
andre.heinecke@intevation.de=Andre Heinecke
bernhard@intevation.de=Bernhard Reiter
rrenkert@intevation.de=Raimund Renkert
wilde@intevation.de=Sascha Wilde
emanuel@intevation.de=Emanuel Schütze