[PATCH xf86-video-intel] configure: Pass user-defined CFLAGS when checking for DRI headers.

[Thierry Reding]

This patch keeps any user-defined CFLAGS and CPPFLAGS when looking for
the DRI headers. One example where this actually failed was with a
sysroot build, where the old snippet would drop the --sysroot argument
passed to the configure script.
---
 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index b6091a8..ba28ebe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -143,8 +143,8 @@ sdkdir=`$PKG_CONFIG --variable=sdkdir xorg-server`
 if test "x$enable_dri" != "xno"; then
         save_CFLAGS="$CFLAGS"
         save_CPPFLAGS="$CPPFLAGS"
-        CFLAGS="$XORG_CFLAGS $DRI_CFLAGS $DRM_CFLAGS"
-        CPPFLAGS="$XORG_CFLAGS $DRI_CFLAGS $DRM_CFLAGS"
+        CFLAGS="$CFLAGS $XORG_CFLAGS $DRI_CFLAGS $DRM_CFLAGS"
+        CPPFLAGS="$CPPFLAGS $XORG_CFLAGS $DRI_CFLAGS $DRM_CFLAGS"
         AC_CHECK_HEADERS([dri.h sarea.h dristruct.h],, [DRI=no],
                 [/* for dri.h */
                  #include <xf86str.h>
-- 
1.7.6