Prefer sys/limits.h over machine/limits.h.

diff --git a/configure b/configure
index 199d569..5296f0a 100755
--- a/configure
+++ b/configure
@@ -7036,6 +7036,7 @@
 
 
 
+
 for ac_header in \
 	IOKit/IOKitLib.h \
 	alsa/asoundlib.h \
@@ -7106,6 +7107,7 @@
 	sys/filio.h \
 	sys/ioctl.h \
 	sys/ipc.h \
+	sys/limits.h \
 	sys/link.h \
 	sys/lwp.h \
 	sys/mman.h \