* child_info.h: Modify magic number.

* dcrt0.cc (_cygwin_testing): Define.
(_dll_crt0): Set _cygwin_testing if CYGWIN_TESTING environment variable exists.
Don't issue "conflicting versions" error if _cygwin_testing is true.
* shared.cc (shared_name): Use _cygwin_testing global rather than testing the
environment.
* syscalls.cc (_write): Remove debugging info.

winsup/cygwin/shared.cc

@@ -43,10 +43,10 @@ char * __stdcall
 shared_name (const char *str, int num)
 {
   static NO_COPY char buf[MAX_PATH] = {0};
-  char envbuf[6];
+  extern bool _cygwin_testing;
 
   __small_sprintf (buf, "%s.%s.%d", cygwin_version.shared_id, str, num);
-  if (GetEnvironmentVariable ("CYGWIN_TESTING", envbuf, 5))
+  if (!_cygwin_testing)
     strcat (buf, cygwin_version.dll_build_date);
   return buf;
 }