w32: Use additional library libiberty.a libiberty.a is part of MinGW and provides useful functions like ffs (MinGW) and getopt (MinGW-w64). It is needed for w64 compilations and allows simpler code for w32. Cc: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>