Revert much of previous erroneous checkin. Add ChangeLog entry.

* pinfo.h: Correctly set __SIGOFFSET.
* path.cc (hash_path_name): Avoid calling library functions for simple copying
of characters.
* shortcut.c: Use WIN32_LEAN_AND_MEAN.
* smallprint.c: Ditto.
* environ.cc (getwinenv): Minor clarity fix.
* localtime.c: No need to include windows.h
* string.h: New file.

winsup/cygwin/net.cc

@@ -1931,9 +1931,9 @@ wsock_init ()
   static LONG NO_COPY here = -1L;
   static int NO_COPY wsock_started = 0;
 
-  while (ilockincr (&here))
+  while (InterlockedIncrement (&here))
     {
-      ilockdecr (&here);
+      InterlockedDecrement (&here);
       Sleep (0);
     }
   if (!wsock_started && (wsock32_handle || ws2_32_handle))
@@ -1960,6 +1960,6 @@ wsock_init ()
 	  wsock_started = 1;
         }
     }
-  ilockdecr (&here);
+  InterlockedDecrement (&here);
 }