qemu: explicitly disable dependency on libpmem, libudev, libxml2

Supersedes openwrt/packages#8571

Reported-by: Rosen Penev rosenp@gmail.com
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

utils/qemu/patches/0001-configure-allow-disable-fortify_source.patch

@@ -1,7 +1,7 @@
-From 0b4011cd0983ced6e065f397049f967656494793 Mon Sep 17 00:00:00 2001
+From 82d1bb429533dcab4278ed21afc19ee303d7d3f5 Mon Sep 17 00:00:00 2001
 From: Yousong Zhou <yszhou4tech@gmail.com>
 Date: Sat, 24 Feb 2018 13:43:19 +0800
-Subject: [PATCH 1/3] configure: allow disable fortify_source
+Subject: [PATCH 1/4] configure: allow disable fortify_source
 
 Tell build system of qemu to not add _FORTIFY_SOURCE options and let the
 OpenWrt base build system decide flavor of fortify_source to use
@@ -10,18 +10,15 @@ OpenWrt base build system decide flavor of fortify_source to use
  1 file changed, 2 insertions(+)
 
 diff --git a/configure b/configure
-index 0c6e757..8ea3fdd 100755
+index 0a3c6a72c3..d274df816c 100755
 --- a/configure
 +++ b/configure
-@@ -1313,6 +1313,8 @@ for opt do
+@@ -1491,6 +1491,8 @@ for opt do
    ;;
-   --disable-git-update) git_update=no
+   --disable-libpmem) libpmem=no
    ;;
 +  --disable-fortify-source) fortify_source="no"
 +  ;;
    *)
        echo "ERROR: unknown option $opt"
        echo "Try '$0 --help' for more information"
--- 
-1.8.3.1
-