Remove support for Metrowerks compiler

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 7699fe2141)

src/sqlite/os.h

@@ -21,25 +21,22 @@
 ** Figure out if we are dealing with Unix, Windows or MacOS.
 **
 ** N.B. MacOS means Mac Classic (or Carbon). Treat Darwin (OS X) as Unix.
-**      The MacOS build is designed to use CodeWarrior (tested with v8)
 */
 #if !defined(OS_UNIX) && !defined(OS_TEST) && !defined(OS_OTHER)
 # define OS_OTHER 0
 # ifndef OS_WIN
-#   if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
-#     define OS_WIN 1
-#     define OS_UNIX 0
-#   else
-#     define OS_WIN 0
-#     define OS_UNIX 1
+#  if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
+#    define OS_WIN 1
+#    define OS_UNIX 0
+#  else
+#    define OS_WIN 0
+#    define OS_UNIX 1
 #  endif
 # else
 #  define OS_UNIX 0
 # endif
 #else
-# ifndef OS_WIN
-#  define OS_WIN 0
-# endif
+# define OS_WIN 0
 #endif
 
 /*