fix mingw

Author: wtdcode

qemu/configure

@@ -198,6 +198,8 @@ ld_has() {
 # make source path absolute
 source_path=$(cd "$(dirname -- "$0")"; pwd)
 
+# Avoid having D:\ in $PWD under MinGW.
+PWD=$(pwd)
 if printf %s\\n "$source_path" "$PWD" | grep -q "[[:space:]:]";
 then
   error_exit "main directory $source_path or $PWD cannot contain spaces nor colons"