Replace Qemu by QEMU in w32 installation path (prefix)

The official spelling is QEMU.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/configure b/configure
index 6f850a6..671b232 100755
--- a/configure
+++ b/configure
@@ -519,7 +519,7 @@
   if compile_prog "" "-liberty" ; then
     LIBS="-liberty $LIBS"
   fi
-  prefix="c:/Program Files/Qemu"
+  prefix="c:/Program Files/QEMU"
   mandir="\${prefix}"
   datadir="\${prefix}"
   docdir="\${prefix}"