[RESEND][PATCH libdrm] configure.ac fix build error for config.h in autotools

[Seung-Woo Kim]

After the commit 0926f0af54d6 ("meson,configure: include config.h
automatically"), there is build error for autotools because
config.h is not included. Fix the error by adding "-include
config.h" to CPPFLAGS instead of CFLAGS from configure.ac.

Reference: https://bugs.freedesktop.org/show_bug.cgi?id=106561
Signed-off-by: Seung-Woo Kim <sw0312.kim at samsung.com>
---
It looks like missed from mailing list, so I resend.
---
 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/configure.ac b/configure.ac
index 7e7c8d3..d72e84a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -541,7 +541,7 @@ else
     AC_DEFINE(HAVE_VISIBILITY, 0)
 fi
 
-CFLAGS="$CFLAGS -include config.h"
+CPPFLAGS="$CPPFLAGS -include config.h"
 
 AC_SUBST(WARN_CFLAGS)
 AC_CONFIG_FILES([
-- 
1.7.4.1