Merge branch 'master' of https://github.com/pirDOL/fio

* 'master' of https://github.com/pirDOL/fio:
  configure: support --extra-ldflags

Author: vincentkfu

configure

@@ -215,6 +215,8 @@ for opt do
   ;;
   --extra-cflags=*) CFLAGS="$CFLAGS $optarg"
   ;;
+  --extra-ldflags=*) LDFLAGS="$LDFLAGS $optarg"
+  ;;
   --build-32bit-win) build_32bit_win="yes"
   ;;
   --target-win-ver=*) target_win_ver="$optarg"