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Make LFS-checks work with  MinGW.org-MinGW

MingW-W64 supports _FILE_OFFSET_BITS and does not have off64_t, while
the old/classic MinGW from MinGW.org does not have this support. Treat
DJGPP and MinGW.org-MinGW the same way (use off_64_t).

Fixes #67.

--- a/include/dumb.h

+++ b/include/dumb.h

@@ -98,9 +98,18 @@

 typedef DUMB_OFF_T_CUSTOM dumb_off_t;

 #elif defined _MSC_VER || defined __WATCOMC__

 typedef __int64 dumb_off_t;

-#elif defined __DJGPP__

+#elif defined __DJGPP__ || defined __MINGW32__

+/* MingW-W64 does not have off64_t and supports _FILE_OFFSET_BITS,

+ * DJGPP and old MinGW do have off64_t, but don't support _FILE_OFFSET_BITS.

+ */

+#include <sys/types.h>

+#if defined(__MINGW64_VERSION_MAJOR)

+typedef off_t dumb_off_t;

+#else

 typedef off64_t dumb_off_t;

-#elif _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 500 || defined __MINGW32__

+#endif

+#elif _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 500

+#include <sys/types.h>

 typedef off_t dumb_off_t;

 #else

 typedef long long dumb_off_t;

@@ -118,7 +127,7 @@

  */

 #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)) &&                \

     !defined __cplusplus

-_Static_assert(sizeof(dumb_off_t) >= 8, "fuse: off_t must be 64bit");

+_Static_assert(sizeof(dumb_off_t) >= 8, "dumb: off_t must be 64bit");

 #else

 struct dumb_off_t_needs_to_be_at_least_8_bytes {

     unsigned int dumb_off_t_needs_to_be_at_least_8_bytes_