Link with xshmfence, reference miSyncShmScreenInit in sdksyms

This gets the server to link with xshmfence again, and also ensures
that the miSyncShm code is linked into the server with the reference
from sdksyms.

Signed-off-by: Keith Packard <keithp@keithp.com>

configure.ac

@@ -1144,6 +1144,7 @@ AM_CONDITIONAL(XSHMFENCE, test "x$HAVE_XSHMFENCE" = xyes)
 case x"$HAVE_XSHMFENCE" in
 	xyes)
 		AC_DEFINE(HAVE_XSHMFENCE, 1, [Have X Shared Memory Fence library])
+		REQUIRED_LIBS="$REQUIRED_LIBS xshmfence"
 		;;
 esac
 

hw/xfree86/sdksyms.sh

@@ -44,6 +44,9 @@ cat > sdksyms.c << EOF
 /* miext/sync/Makefile.am */
 #include "misync.h"
 #include "misyncstr.h"
+#if HAVE_XSHMFENCE
+#include "misyncshm.h"
+#endif
 
 /* Xext/Makefile.am -- half is module, half is builtin */
 #ifdef XV

include/dix-config.h.in

@@ -449,4 +449,7 @@
 #include "dix-config-apple-verbatim.h"
 #endif
 
+/* Have support for X shared memory fence library (xshmfence) */
+#undef HAVE_XSHMFENCE
+
 #endif /* _DIX_CONFIG_H_ */

include/xorg-config.h.in

@@ -145,4 +145,7 @@
 /* Support APM/ACPI power management in the server */
 #undef XF86PM
 
+/* Have support for X shared memory fence library (xshmfence) */
+#undef HAVE_XSHMFENCE
+
 #endif /* _XORG_CONFIG_H_ */