drop obsolete HAVE_DIX_CONFIG_H

The symbol controls whether to include dix-config.h, and it's always set,
thus we don't need it (and dozens of ifdef's) anymore.

This commit only removes them from our own source files, where we can
guarantee that dix-config.h is present - leaving the (potentially exported)
headers untouched.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

exa/exa.c

@@ -28,9 +28,7 @@
  * memory management.
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <stdlib.h>
 

exa/exa_accel.c

@@ -27,9 +27,7 @@
  *
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 #include "exa_priv.h"
 #include <X11/fonts/fontstruct.h>
 #include "dixfontstr.h"

exa/exa_classic.c

@@ -22,9 +22,7 @@
  *
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <string.h>
 

exa/exa_driver.c

@@ -22,9 +22,7 @@
  *
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <string.h>
 

exa/exa_glyphs.c

@@ -40,9 +40,7 @@
  * Based on code by: Keith Packard
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <stdlib.h>
 

exa/exa_migration_classic.c

@@ -26,9 +26,7 @@
  *
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <string.h>
 

exa/exa_migration_mixed.c

@@ -22,9 +22,7 @@
  *
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <string.h>
 

exa/exa_mixed.c

@@ -22,9 +22,7 @@
  *
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <string.h>
 

exa/exa_render.c

@@ -22,9 +22,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-#ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
-#endif
 
 #include <stdlib.h>