More compiler warning fixes

These were in SUSE distris for quite some time and got
forwardported from 1.8.10 to 1.8.11.


Index: lib/ipmi_sdradd.c
===================================================================
--- lib/ipmi_sdradd.c.orig	2015-01-14 15:38:00.728760259 +0100
+++ lib/ipmi_sdradd.c	2015-01-14 15:38:11.500760430 +0100
@@ -38,6 +38,7 @@
 #include <stdio.h>
 #include <time.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 #include <ipmitool/helper.h>
 #include <ipmitool/log.h>
Index: lib/ipmi_hpmfwupg.c
===================================================================
--- lib/ipmi_hpmfwupg.c.orig	2015-01-14 15:38:00.728760259 +0100
+++ lib/ipmi_hpmfwupg.c	2015-01-14 15:38:11.504760430 +0100
@@ -40,6 +40,8 @@
 #include "../src/plugins/lan/md5.h"
 #include <stdio.h>
 #include <time.h>
+#include <ctype.h>
+#include <unistd.h>
 #include <sys/param.h>
 
 #if HAVE_CONFIG_H
Index: configure.ac
===================================================================
--- configure.ac.orig	2015-01-14 15:38:00.728760259 +0100
+++ configure.ac	2015-01-14 16:29:03.744808956 +0100
@@ -25,6 +25,7 @@
 AC_C_CONST
 AC_C_INLINE
 AC_C_BIGENDIAN
+AC_GNU_SOURCE
 
 AC_FUNC_SELECT_ARGTYPES
 AC_FUNC_STRTOD
@@ -32,7 +33,7 @@
 AC_CHECK_FUNCS([memmove memset strchr strdup strerror])
 AC_CHECK_FUNCS([getpassphrase])
 
-CFLAGS="$CFLAGS -Wall -Wextra -std=c99 -pedantic -Wformat -Wformat-nonliteral"
+CFLAGS="$CFLAGS -fno-strict-aliasing -Wreturn-type -std=c99"
 
 AM_PROG_LIBTOOL
 LIBTOOL="$LIBTOOL --silent"