fix(includedir) Fix ordering if include dirs

There has been a long standind bug where INCLUDE_DIRS /usr/include is
included twice.  The more important problem is it is before the
/usr/local/include.

  This commit fixes the ordering.

Signed-off-by: Manoj Srivastava <srivasta@debian.org>

src/read.c

@@ -107,11 +107,13 @@ static const char *default_include_directories[] =
    This is defined as a placeholder.  */
 # define INCLUDEDIR "."
 #endif
-    INCLUDEDIR,
 #ifndef _AMIGA
     "/usr/gnu/include",
     "/usr/local/include",
     "/usr/include",
+    INCLUDEDIR,
+#else
+    INCLUDEDIR,
 #endif
     0
   };