portab.h: Restructure and clean up code

- Don't use HAVE_SYS_TYPES_H, <sys/types.h> is a required header now.
- Streamline check for boolean data types.
- Better indent #ifdef constructs.

src/portab/portab.h

@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
+ * Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -23,28 +23,6 @@
 # define NDEBUG
 #endif
 
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
-#ifdef HAVE_INTTYPES_H
-# include <inttypes.h>
-# define NGIRC_GOT_INTTYPES
-#else
-# ifdef HAVE_STDINT_H
-#  include <stdint.h>
-#  define NGIRC_GOT_INTTYPES
-# endif
-#endif
-
-#ifdef HAVE_STDDEF_H
-# include <stddef.h>
-#endif
-
-#ifdef HAVE_STDBOOL_H
-# include <stdbool.h>
-#endif
-
 /* compiler features */
 
 #if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 7))
@@ -65,6 +43,22 @@
 
 /* datatypes */
 
+#include <sys/types.h>
+
+#ifdef HAVE_STDDEF_H
+# include <stddef.h>
+#endif
+
+#ifdef HAVE_INTTYPES_H
+# include <inttypes.h>
+# define NGIRC_GOT_INTTYPES
+#else
+# ifdef HAVE_STDINT_H
+#  include <stdint.h>
+#  define NGIRC_GOT_INTTYPES
+# endif
+#endif
+
 #ifndef PROTOTYPES
 # ifndef signed
 #  define signed
@@ -83,7 +77,9 @@ typedef unsigned short UINT16;
 typedef unsigned int UINT32;
 #endif
 
-#ifndef HAVE_STDBOOL_H
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
 typedef unsigned char bool;
 # define true (bool)1
 # define false (bool)0