Bug fix for bug #15843 "Added mmap support in myisam creates compile problem

on AIX 5.2"

Added dummy definition of MAP_NORESERVE for systems which doesn't provide it,
removed duplicates

my_sys.h:
  added definition for MAP_NORESERVE
  (for Irix and AIX systems)
sql_map.cc:
  removed definition of MAP_NORESERVE
mi_packrec.c:
  removed definition of MAP_NORESERVE and MMAP_PRIVATE

include/my_sys.h

@@ -820,6 +820,9 @@ my_bool my_gethwaddr(uchar *to);
 #ifndef MAP_NOSYNC
 #define MAP_NOSYNC      0
 #endif
+#ifndef MAP_NORESERVE   
+#define MAP_NORESERVE 0         /* For irix and AIX */
+#endif
 
 #ifdef HAVE_MMAP64
 #define my_mmap(a,b,c,d,e,f)    mmap64(a,b,c,d,e,f)

sql/sql_map.cc

@@ -25,10 +25,6 @@
 #include <sys/mman.h>
 #endif
 
-#ifndef MAP_NORESERVE
-#define MAP_NORESERVE 0				// For IRIX
-#endif
-
 mapped_files::mapped_files(const my_string filename,byte *magic,uint magic_length)
 {
 #ifdef HAVE_MMAP

storage/myisam/mi_packrec.c

@@ -1176,13 +1176,6 @@ static uint max_bit(register uint value)
 static int _mi_read_mempack_record(MI_INFO *info,my_off_t filepos,byte *buf);
 static int _mi_read_rnd_mempack_record(MI_INFO*, byte *,my_off_t, my_bool);
 
-#ifndef MAP_NORESERVE
-#define MAP_NORESERVE 0		/* For irix */
-#endif
-#ifndef MAP_FAILED
-#define MAP_FAILED -1
-#endif
-
 my_bool _mi_memmap_file(MI_INFO *info)
 {
   byte *file_map;