Bug#17368 General log and slow query log don't work

- Port ha_tina.cc to run on windows 


include/my_sys.h:
  Add define for MAP_PRIVATE, to be used in my_mmap to decide what kind of map to open.
mysys/my_mmap.c:
  Remove unused flProtect
  Look at "prot" argument when deciding if map should be read or write.
storage/csv/ha_tina.cc:
  Remove "include <sys/mman.h>", use the defines and functions from mysys
  Add cast to byte* when calling 'my_write'
  Add cast to char* when calling 'buffer.set'
  munmap the file before setting it's size, my_chsize will fail if file is mapped.
storage/csv/ha_tina.h:
  Remove "typedef" since no name is defined and "tina_set" is used in the code

include/my_sys.h

@@ -850,6 +850,7 @@ my_bool my_gethwaddr(uchar *to);
 #define PROT_WRITE       2
 #define MAP_NORESERVE    0
 #define MAP_SHARED       0x0001
+#define MAP_PRIVATE      0x0002
 #define MAP_NOSYNC       0x0800
 #define MAP_FAILED       ((void *)-1)
 #define MS_SYNC          0x0000