REORG: include: move MIN/MAX from tools.h to compat.h

Given that these macros are usually provided by sys/param.h, better move
them to compat.h.
diff --git a/include/common/compat.h b/include/common/compat.h
index 05701c1..34fbac5 100644
--- a/include/common/compat.h
+++ b/include/common/compat.h
@@ -58,6 +58,14 @@
 #define BITS_PER_INT    (8*sizeof(int))
 #endif
 
+#ifndef MIN
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+#endif
+
+#ifndef MAX
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+#endif
+
 /* this is for libc5 for example */
 #ifndef TCP_NODELAY
 #define TCP_NODELAY     1
diff --git a/include/common/tools.h b/include/common/tools.h
index c7c0c88..8db38c6 100644
--- a/include/common/tools.h
+++ b/include/common/tools.h
@@ -22,16 +22,6 @@
 #ifndef _COMMON_TOOLS_H
 #define _COMMON_TOOLS_H
 
-#include <sys/param.h>
-
-#ifndef MIN
-#define MIN(a, b) (((a) < (b)) ? (a) : (b))
-#endif
-
-#ifndef MAX
-#define MAX(a, b) (((a) > (b)) ? (a) : (b))
-#endif
-
 #define SWAP(a, b) do { typeof(a) t; t = a; a = b; b = t; } while(0)
 
 /* return an integer of type <ret> with only the highest bit set. <ret> may be