fix build issue on i686-pc-mingw (struct __timeb64 is missing)

configure.ac

@@ -31,6 +31,7 @@ AC_TYPE_UINT8_T
 AC_CHECK_TYPES([ptrdiff_t])
 
 AC_SYS_LARGEFILE
+AC_CHECK_TYPES([struct __timeb64],[],[],[[#include <sys/timeb.h>]])
 AC_FUNC_FSEEKO
 AC_CHECK_FUNCS([sigaction gettimeofday nl_langinfo strdup _vscprintf])
 AC_CHECK_FUNC(getopt_long)

src/compat_win32.c

@@ -31,8 +31,13 @@ int __wgetmainargs(int *, wchar_t ***, wchar_t ***, int, _startupinfo *);
 
 int64_t aacenc_timer(void)
 {
+#if _MSC_VER || HAVE_STRUCT___TIMEB64
     struct __timeb64 tv;
     _ftime64(&tv);
+#else
+    struct timeb tv;
+    ftime(&tv);
+#endif
     return (int64_t)tv.time * 1000 + tv.millitm;
 }