swrast: Build fix for Solaris

Fixes regression from commit 5b2d3480f5

Cc: "10.5 10.6" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>

configure.ac

@@ -649,6 +649,7 @@ if test "x$enable_asm" = xyes; then
 fi
 
 AC_CHECK_HEADER([xlocale.h], [DEFINES="$DEFINES -DHAVE_XLOCALE_H"])
+AC_CHECK_HEADER([sys/sysctl.h], [DEFINES="$DEFINES -DHAVE_SYS_SYSCTL_H"])
 AC_CHECK_FUNC([strtof], [DEFINES="$DEFINES -DHAVE_STRTOF"])
 
 dnl Check to see if dlopen is in default libraries (like Solaris, which

src/mesa/drivers/dri/swrast/swrast.c

@@ -62,7 +62,9 @@
 #include "swrast/s_context.h"
 
 #include <sys/types.h>
-#include <sys/sysctl.h>
+#ifdef HAVE_SYS_SYSCTL_H
+# include <sys/sysctl.h>
+#endif
 
 const __DRIextension **__driDriverGetExtensions_swrast(void);