msys: fixed version handling

there is no CYGWIN_VERSION_DLL_EPOCH anymore. epoch and major has to be calculated.
define CYGWIN_VERSION_DLL_MAJOR 3004 means version 3.4.x.

Author: mahaase

pym/bob/languages.py

@@ -45,8 +45,8 @@
 {
 #if defined(CYGWIN_VERSION_DLL_IDENTIFIER)
     printf("%s/%d.%d.%d\n", CYGWIN_VERSION_DLL_IDENTIFIER,
-        CYGWIN_VERSION_DLL_EPOCH,
-        CYGWIN_VERSION_DLL_MAJOR,
+        CYGWIN_VERSION_DLL_MAJOR / 1000,
+        CYGWIN_VERSION_DLL_MAJOR % 1000,
         CYGWIN_VERSION_DLL_MINOR);
 #elif defined(__MSVCRT_VERSION__)
     printf("mingw%d/msvcrt-%03x\n",