lib: Provide MAX and MIN in system.h

This change also creates a new header file libeu.h to provide the
prototypes for the function of libeu. That hides the definition of function
crc32, which can conflict with zlib, from libelf. It also prevents mistakes
to refer those functions from a component which doesn't link with libeu,
such as libelf.

Signed-off-by: Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>

libdwelf/ChangeLog

@@ -1,3 +1,8 @@
+2015-10-11  Akihiko Odaki  <akihiko.odaki.4i@stu.hosei.ac.jp>
+
+	* dwelf_strtab.c: Remove sys/param.h include.
+	(MIN): Remove definition.
+
 2016-07-08  Mark Wielaard  <mjw@redhat.com>
 
 	* Makefile.am (libdwelf_a_SOURCES): Add dwelf_strtab.c.

libdwelf/dwelf_strtab.c

@@ -38,15 +38,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/param.h>
 
 #include "libdwelfP.h"
 #include <system.h>
 
-#ifndef MIN
-# define MIN(a, b) ((a) < (b) ? (a) : (b))
-#endif
-
 
 struct Dwelf_Strent
 {