[PATCH:macros] Add AC_LANG_DEFINES_PROVIDED to XORG_RAW_CPP to silence autoconf warnings

[Alan Coopersmith]

Since we're intentionally doing a special case to just check cpp output,
and not a full program compilation, add the magic macro to silence:

configure.ac:46: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
aclocal.m4:1077: XORG_PROG_RAWCPP is expanded from...
configure.ac:46: the top level

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 xorg-macros.m4.in |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/xorg-macros.m4.in b/xorg-macros.m4.in
index f89efb6..a21cf7e 100644
--- a/xorg-macros.m4.in
+++ b/xorg-macros.m4.in
@@ -64,7 +64,8 @@ AC_PATH_PROGS(RAWCPP, [cpp], [${CPP}],
 # which is not the best choice for supporting other OS'es, but covers most
 # of the ones we need for now.
 AC_MSG_CHECKING([if $RAWCPP requires -undef])
-AC_LANG_CONFTEST([Does cpp redefine unix ?])
+AC_LANG_CONFTEST([Does cpp redefine unix ?
+		  AC_LANG_DEFINES_PROVIDED])
 if test `${RAWCPP} < conftest.$ac_ext | grep -c 'unix'` -eq 1 ; then
 	AC_MSG_RESULT([no])
 else
@@ -82,7 +83,8 @@ fi
 rm -f conftest.$ac_ext
 
 AC_MSG_CHECKING([if $RAWCPP requires -traditional])
-AC_LANG_CONFTEST([Does cpp preserve   "whitespace"?])
+AC_LANG_CONFTEST([Does cpp preserve   "whitespace"?
+		  AC_LANG_DEFINES_PROVIDED])
 if test `${RAWCPP} < conftest.$ac_ext | grep -c 'preserve   \"'` -eq 1 ; then
 	AC_MSG_RESULT([no])
 else
-- 
1.7.3.2