Bug#906642: xserver-xorg-video-mach64 FTCBFS: one more AC_CHECK_FILE abuse

[Helmut Grohne <helmut@subdivi.de>]

Source: xserver-xorg-video-r128
Version: 6.11.0-1
Tags: patch upstream
User: helmutg@debian.org
Usertags: rebootstrap

Thank you for fixing #888692. Unfortunatly, another AC_CHECK_FILE is now
present and makes xserver-xorg-video-r128 fail again. The attached patch
fixes that and makes it cross buildable. Please consider applying it.

Helmut

--- xserver-xorg-video-r128-6.11.0.orig/configure.ac
+++ xserver-xorg-video-r128-6.11.0/configure.ac
@@ -131,7 +131,7 @@
 AC_MSG_CHECKING([whether to enable EXA support])
 if test "x$EXA" = xyes; then
         AC_MSG_RESULT(yes)
-        AC_CHECK_FILE(${sdkdir}/exa.h, [have_exa_h="yes"], [have_exa_h="no"])
+        AS_IF([test -f "${sdkdir}/exa.h"], [have_exa_h="yes"], [have_exa_h="no"])
 else
         AC_MSG_RESULT(no)
 fi