0020716: Eliminate usage of "config.h" header file

All inclusions of "config.h" were removed.

All places where macros defined by config.h were checked and removed

Small corrections for mac os.

Unused code in file OSD_Disk.cxx was removed.

Unused macros and includes were removed from samples and code.

Added necessary includes for MacOS.

Correct new additional compilation warning on Linux platform.

Fix for error in OSD_Chronometer on Debian70/Fedora18

src/Draw/Draw_BasicCommands.cxx

@@ -51,26 +51,7 @@ static clock_t CPU_CURRENT; // cpu time already used at last
 #else /* _WIN32 */
 
 #include <sys/resource.h>
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#ifdef HAVE_STRINGS_H
-# include <strings.h>
-#endif
-
-#if defined(HAVE_TIME_H)
-# include <time.h>
-#endif
-
-#ifdef HAVE_SIGNAL_H
-# include <signal.h>
-#endif
-
-#ifdef HAVE_SYS_SIGNAL_H
-# include <sys/signal.h>
-#endif
+#include <signal.h>
 
 #if defined (__hpux) || defined ( HPUX )
 #define RLIM_INFINITY   0x7fffffff