Fix some more Win32 compat issues in processor code

R=mark at https://breakpad.appspot.com/535003/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1122 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/minidump.cc

@@ -37,15 +37,13 @@
 
 #include <assert.h>
 #include <fcntl.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <string.h>
 #include <time.h>
 
 #ifdef _WIN32
 #include <io.h>
-#if _MSC_VER < 1600
-typedef SSIZE_T ssize_t;
-#endif
 #define PRIx64 "llx"
 #define PRIx32 "lx"
 #define snprintf _snprintf