Patch, CMake, fix some warnings in DTL

[Yu Jin]

Can I commit the attached patch? It is used here (dtl.h):

#if (defined(__cplusplus) || defined(__STDC__) || defined(c_plusplus))
#define STDC 1
#else
#define STDC 0
#endif

/* Version (Traditional or ANSI) of C affects prototype and type
definitions */
#if STDC
#define ARGS(parenthesized_list) parenthesized_list
#else /* NOT STDC */
#define ARGS(parenthesized_list) ()
#endif /* NOT STDC */

#if STDC
#define Void void     <-- meant to activate this
#define VOID void
#define FILE_BEGIN SEEK_SET
#else  /* NOT STDC */
#define Void int        <-- currently this is used
#define VOID
#define FILE_BEGIN 0
#endif /* NOT STDC */

so the functions which don't return anything actually end up as
"int fun(...)" not "void fun(...)" and Warnings are produced.

Can also enclose it in a "if (WIN32)" block if not wanted on other
platforms.
-- 
    Eugene
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