Make Xephyr build on Solaris:

Add #include <sys/file.h> on Solaris for FNONBLOCK/FASYNC definitions
hw/kdriver/linux/Makefile.am Move agp.c & agp.h to KDRIVE_HW_SOURCES since
    they're not needed for Xephyr-only builds
Add -lrt to XEPHYR_LIBS if needed to get nanosleep().

hw/kdrive/src/kinput.c

@@ -37,6 +37,9 @@
 #include "kkeymap.h"
 #include <signal.h>
 #include <stdio.h>
+#ifdef sun
+#include <sys/file.h> /* needed for FNONBLOCK & FASYNC */
+#endif
 
 #ifdef XKB
 #include <X11/extensions/XKBsrv.h>